With all due respect, I disagree that GRRM is purposefully extending the series to extend his bankroll. I do agree that he's now enjoying financial success beyond his dreams when he imagined this story in the early nineties. The tale has grown in the telling. I probably misremember, but I think it was originally to be four books... then five... then six... then seven. Remember that he'd also planned a five year break after the third book, but that he could not make it work... so I believe he's filled in some spaces and tried to develop some characters and work in new ones in the meantime. As for the characters in question...
Aegon, son of Rhaegar, is mentioned fairly early in AGOT... and I think Aegon is the infant that Dany sees in the House of the Undying. Jon Connington is first mentioned in ACOK, if not AGOT... and he's mentioned a number of times in ASOS. It is my opinion that the story is so huge and the named characters number in the thousands that we tend to never notice the clues or else we forget them in the mass of information... and so we are surprised when characters and plots appear as if from necessity or desperation.
Would ASOIAF look the same if GRRM rewrote it now? Probably not. I'm sure he'd trim some fat and add other info at different points.
Mayhaps, AFFC and ADWD were not as fast paced as most would have liked. Yet, I believe that GRRM's motivation was to fill in the blanks and not to fill his pockets. I don't know the man... well, he signed two of my books and answered a question at a Denver book signing, but I cannot say that I know the man. I know his politics are the opposite of mine... and I'd guess that his religious views are not even close to mine.
It is my opinion that the appearances of Aegon and Connington have not come from need, but to push the pace of the story again. Dany is the only claimant to the Iron Throne of whom we have a POV. Connington gives us Aegon's story as Davos gives us Stannis' while Tyrion, Cersei, and Sansa gave us Joffrey's. I find Connington to be an intriguing character. He is intelligent, resourceful, loyal, and resolute. More importantly, he's a leader of men... a respected commander. He's a player only by necessity. In short, he's a lot like Eddard.
Eddard's POV gave us the tale of Robert. Eddard's men respected him. Robert trusted him. Eddard's loyalty cost him everything.
Enter Jon Connington... With his terminal illness, both his vengeance and justice are on short time tables. His experience, as the losing commander of the beginning of Robert's Rebellion, will serve him well. He will continue to be bold. He will not wait for the Lannisters to build an overwhelming coalition.
With Dany lost in the East... Illyrio and Doran may throw their full support behind behind Aegon. If Middlefinger is a Targaryen loyalist and not in it only for himself, he may support Aegon... I can see Sansa's marriage to Harry the Heir cancelled when Baelish finds out that Aegon is alive and single.
It is my personal opinion that Loras is not grossly injured and clinging to life in a sickbed... but, in fact is also on his way to find and woo Dany (I'm pretending that Quaithe forgot the Rose in her prophecy). This means that the Tyrells are still willing to be on the winning side. And even if Loras is not wooing Dany, the Tyrells still have Willas and have been known as staunch Targaryen supporters in the past. Mace is now the Hand and half the Small Council are Tyrell bannermen. With Kevan dead and Aegon announcing a Targaryen return, all Mace has to do is arrest Tommen and offer Margary to Aegon. She still claims to be thrice wed and never bedded... although the Faith may say something different.
So... I can picture the Vale, Dorne, and the Reach supporting Aegon. The Lannisters cannot match that. They control the Westerlands and they are supported by House Bolton in the North, but most of the Riverlords hate them... the exception being House Frey. The Stormlands are under attack and will not be supported unless the Hand or the Warden of the East gives it to them. The Hand is Mace and I dont' think he'll commit to action until he knows he'll be on the winning side. The Warden of the East is Jaime... who is missing. The Vale calls young Robert the true Warden, but I don't think that Baelish will commit to battle until he knows he'll win... and he may still decide to back Aegon. Don't forget that he is also Lord Paramount of the Trident, i.e. the Riverlords answer to him and if he calls for Lannister and Frey blood, they'll willingly oblige.
I know I've wanted to ignore Quaithe's prophecy, but she also has said since ACOK that Dany must go to Asshai. If that is true, then Dany will not get to Westeros until A Dream of Spring, the seventh book. I don't know what all will happen, but Aegon could win the throne well before Dany ever arrives. It may be that her story is that of TPTWP and AAR. She may sacrifice her claim to the Iron Throne to save the realm from The Other.
Who will win The Game of Thrones? is the title of the thread. The claimants, heirs are... Stannis, Daenerys, Aegon, Tommen, Myrcella, and Shireen. It is also my personal theory that Cersei, Jaime, Tyrion, and Jon Snow are all bastards of Aerys II. I also believe that neither Baelish nor Margaery can be omitted from this list because of their aspirations to power.
I may change my mind later, but I think Connington will not need to marry Arianne to Aegon because the Martells will ally for vengeance. I think Margaery will want to get rid of Tommen and trade up for Aegon. I think the Tyrell plans will fall through when Baelish gets Aegon to marry Sansa. Faced with losing, the Tyrells will announce they were duped by the Lannisters and that Margaery never consumated any marriage with any Baratheon... Renly, Joffrey, or Tommen. Mace will then bend the knee. Cersei will flee to Casterly Rock... leaving Tommen to be executed. Jaime will ride to save Tommen as Barristan once went to save Aerys II, but Jaime will fail and die. Tyrion will ally himself with Aegon. He will kill Cersei and rule Casterly Rock. Connington will retire to Griffin's Roost. It does not matter what happens between Houses Frey, Bolton, Manderly, and Umber and their quarrels and alliances with Stannis. Many will die fighting. More will die from the winter. They'll get sorted out in the spring. All hail King Aegon, the sixth of his name. All hail Queen Sansa. All hail Lord Baelish, Hand of the King.