[Florian the Fool]

At the risk of bringing the thread back on topic....everyone is assuming that Daenerys will be one of the three heads. I think that it would fit well with GRRM's track record so far if Dany did not survive to see her dragons reclaim Westeros and defeat the Others. I can easily imagine her recruiting one other dragonrider (quite possible Tyrion) and that rider then having to recruit a further two following Dany's death (at the hand's of Jorah Mormont, maybe, but that's just wild speculation on my part). Maybe Jon and Bran?

I forget the nature of the prophecy regarding PTWP/AA. Does PTWP/AA have anything to do beyond reclaiming the weapon that can defeat evil? If not, then Dany has already fulfilled that prophecy and is expendible. And even that is assuming that the prophecy has to be fulfilled which, given GRRM's fondness for subverting genre tropes, is not a given.

Thinking while I'm typing here, so a lot of this may be garbage. If so, apologies.