"God's Beard!"
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What about Aemon dying and Sam getting his freak on with Gilly?
Aemon dying can be in Braavos, and Gilly is part of the arrival to Oldtown.
Dareon is kind of essential to Arya and her appearance to Sam and her own story, though.
He doesn't need to be. I think they should have Sam looking for news of dragons for Aemon's last wish, and find people to talk to through Arya. Then they could segue to Arya learning.
The show could have problems with Illyn Payne though, as Wilko Johnson has terminal cancer (and elected not to have chemo).
It means where that character is concerned they'll either have to recast or rewrite, and their past recasts have been... dubious.
I mean, recasting Beric was one thing because most people wouldn't remember the characters' previous appearance played by Scott (which was very minor, and the character then went around being raggedy and dying, so a change in appearance is explainable anyway)... but on the other hand you have the Mountain, which really didn't work because most people didn't even realise that Ian Whyte was the Mountain :|
The mountain wasn't that important in the S2 story. You'll notice that he's always in shadow during his scenes. They probably just wanted to bring back the original actor for season 4.