There is too much for one episode for sure.
But of course, they will likely have to cut out plots and characters to make it filmable. The Shaido (especially the Faile bit) seems the most expendable - did that whole thing really have a point, but they might even decide to cut out all of the...
It depends on how long the season is - if it is a 22 episode season, there would be a lot of episodes where not much happens unless they combine
GoT was about the same length as EotW, and was 8 episodes I think, but they had to cut quite a bit out - mostly characters, and some sub plots that...
Books 1-3 all have a big climactic battle at the end, so would be difficult to merge I think. Depending on how long a season is
Book 1
Ep 1 - till the trolloc attack
Ep 2- Till they flee Baerlon?
Ep 3 - After Shadar Logoth when they are all safe
Ep 4-6 - Till they meet up in Caemlyn
Ep 7 - Flee...