Speculation Alert!!!
I would post a Spoiler Alert, but the last line in this post has no basis in fact... yet.
Brian, Jon is not Dany's brother... he's her nephew.
Tyrion is Dany's brother.
I'm a big fan of the Tyrion is a Targ theory. If he, Dany, and Jon are the three heads, it would strike me that all 3 killed their mothers in childbirth.
Omg, I can't believe Boaz is still peddling that ridiculous rumor.
Weirwood said it - Jon isn't an 'unlikely' hero at all. As one of the very few characters who has selflessly given himself over to a cause without the want for power or influence, he is the central hero of the piece - if there is one.
My thoughts of "unlikely" was more that he will reign supreme, but not on the so called "good side". I agree, he has been the central character and has the least amount of character flaws as our other favorite characters.
How will Jon keep his oath to the Night's Watch and be one of the heads of the dragon and rule Winterfell?
Easy: The Wall will be destroyed. Or the Others will be completely obliterated. Or both. Either one (or both) would eliminate the need for the Night's Watch.
Hear my words and bear witness to my vow.
Night gathers, and now my watch begins. It shall not end until my death. I shall take no wife, hold no lands, father no children. I shall wear no crowns and win no glory. I shall live and die at my post. I am the sword in the darkness. I am the watcher on the walls. I am the fire that burns against the cold, the light that brings the dawn, the horn that wakes the sleepers, the shield that guards the realms of men. I pledge my life and honor to the Night's Watch, for this night and all the nights to come.
For reference, here's the oath, as given in AGoT:Night gathers, and now my watch begins. It shall not end until my death. I shall take no wife, hold no lands, father no children. I shall wear no crowns and win no glory. I shall live and die at my post. I am the sword in the darkness. I am the watcher on the walls. I am the fire that burns against the cold, the light that brings the dawn, the horn that wakes the sleepers, the shield that guards the realms of men. I pledge my life and honor to the Night's Watch, for this night and all the nights to come.
It was my understanding that the Nights Watch took an oath to protect and die (i dont know the "words" verbatim) for the Realm, and the "Wall" is merely a tool to their vows. This would mean if the Wall is destroyed The Watch should go down "with it's ship" sort of speak. (if he upholds his oath to the watch, regardless if he's a dragon or not)
I understand they have the right to regroup and retool, but this should be his only duty
I understand what you're saying but I think you're taking it just a tad too far here. I thought the Night's Watch was created specifically to man the Wall and keep the Others out of kingdom. Sure, they've got a fancy oath that holds them there, but that oath mentions nothing about the realm. It only mentions the Night's Watch (in the last line).
If there's no Wall then the Night's Watch could be disbanded. You could hypothesize that maybe the Night's Watch stays together but gets reassigned somewhere else. That somewhere else could be anywhere though. They could be reassigned to King's Landing where all the action is taking place! Their entire purpose could also be restructured and they'd obviously need a new oath so they would be free to come up with new rules. Maybe those new rules wouldn't preclude them from holding lands or taking a wife.
Long story short: A lot of different things could happen that would release Jon from his oath without Jon having to break his oath.
If theres alot of different things that could release him from his oath, then saying the "words" kinda looses its value doesnt it?
What does he do in the final hours of the Nights Watch, when they're being "disbanded"? "Sorry guys, i just found out i had dragon blood, i wish you good tidings, but i've got to go live out my destiny!"
Theres just some who think he will not leave the Wall and there are some who believe he will.
Now you're just ignoring what I'm saying . The words have value obviously because it doesn't appear to the characters in the book that the Wall is going anywhere. If there's no Wall and the Night's Watch is disbanded or relocated then what do you think Jon should do? Hang out on the rubble for the rest of his life because he took that oath? Or move on, perhaps taking the surviving members with him on the next chapter in his life? Maybe the Night's Watch becomes the new elite guard at King's Landing. In any case, my point that there exists ways that could free Jon of his responsibility to the Night's Watch without him ever doing anything else that's dishonorable. I'm not saying that these things will happen but the possibility is there. There are crazier theories out there.
I've got some stuff from the book to back me up on this at least. Mance was searching for the Horn of Winter because it allegedly has the power to destroy the Wall. Mance doesn't use the Horn of Winter because he knows that the Wall is there to keep out the Others not the Wildlings (although I think it was used to wake the giants..i could be wrong on that). Remember, Mance isn't invading the Seven Kingdoms...he's just running from the Others! But now Stannis possesses the Horn of Winter. What's to stop him or someone else from blowing that Horn? The Wall is definitely in peril.
The Night's Watch protects the realm, and is sworn to take no part in civil wars and contests for the throne.
Traditionally, in times of rebellion, they do honor to all kings and obey none.