Paganmoon: Fair enough. You are not the first to dislike the Ironborn/Martell arc, though I think we would know a lot less about Westeros in general without them. I think Asha's and Theon's arc are definitely necessary ( with Theon's arc being one of my favorite in Dance ), and while Victarion may be dull, his chapters are packed with action. I do agree that Damphair is pretty tedious, though I remember Martin telling us that something shocking would happen in a sample chapter he was about to read, though everyone elected to have him read Arianne instead.
Though I don't agree that Quentyn or Aegon are inconsequential. Tidings of Quentyns death will make it hard for the Martells to side with Daenerys, should it come to it, and they will likely side with Aegon instead. ( We are already seeing this unfolding in the Arianne sample chapters ).
Likewise Aegon isn't inconsequential. He has a army and a head start on taking on Westeros. He may be fake, but he won't go away just because of that. If anything, the mummers dragon prophecy tells us that the people of Westeros will be cheering on the 'mummers dragon'.
Of course, all of this ties into the Meereenese knot that Martin have been trying to resolve for some time now. I am guessing in his mind, he simply cannot rush through Daenerys arc and just have her land on Westeros without the proper build-up or even have a bunch of strangers show up in Meereen out of the blue.