Eh...I hadn't really thought in terms of what they would show/cut from AFFC/ADWD, I was simply going on a page count of the combined two vs. the other novels. ADWD is almost the same length as ASoS so it seems they should get at least two seasons out of the combined books.
That being said, I don't think they can really skip the iron born/dorne stuff because those characters seem likely to play fairly important roles in the upcoming seasons. Perhaps Dorne and the Quentyn storyline don't seem terribly compelling right now, but I get the feeling GRRM includes them mainly because of their relevance to TWOW. I imagine the whole Quentyn thing would have been done via flashbacks if GRRM had followed his original plan and that we would be getting said flashbacks because they were pertinent to whatever the current goings-on were in TWOW. Similarly, Euron and Victarion both seem like they have big things to do before the series is over.
I think, instead of cutting them from the series, their roles could be embellished and made more interesting. Especially in the case of Quentyn, the show runners are probably going to want viewers to be more attached to him before his fiery death than readers were ergo, more scenes for him.
Likewise, there is lots of unexplored territory for Arya in the house of black and white and for Sansa training with Baelish. Perhaps a bit more time with Sam at the Citadel as well, getting more acquainted with Marwen (is that the magic loving maester's name?) and such.
Basically, there's plenty of nothing going on in the pages of AFFC/ADWD. But there's also plenty of stuff that I wish GRRM had spent a bit more time on as well. All this being said, Jag and Rolynd may be right in that there is only two season's worth of material in them.
