Originally Posted by The Imp
I think that season tow has shown us that David and Dan are willing to axe large chunks of minor plot (Arya and the boys wandering for what seems to be an eternity before they are actually captured)
The nice thing about reading the boo0ks is that you get an enormous amount of detail and story information that couldn't possibly be fit into a TV show. The nice thing about a TV show is the writers and producers are forced to go with a leaner and more concise version of the story that the book tells.
It;s win/win for readers, and the non0readers don't know what they're missing
PS While I wenjoyed aDWD and am enjoying it even more the second time around, I could have done with the endless Meereen chapters, as well as much of Tyrion's trials and tribulations, which seemed almost "Job-esque" in retrospect. The book would have been better IMO with more Bran and Arya, and less Dany and Tyrion.
I don't think it would work out the same as cutting/changing parts of Arya's story for brevity, because there is still story to be told, and in fact too much of it to be able to fit it all in (which is exactly why they are forced to cut minor plot, as you said). But in Dany's case, I'd argue there is not enough story. Basically for two seasons, Dany will be playing at being Queen and talking to people in a royal capacity, and not much else; so for seasons 5 and 6, her story is going to progress very little, if at all, generally speaking in terms of returning to Westeros. Cutting parts of her story in Mereen out, basically means she is not going to see very much screen time, which may not be a huge deal as long as the rest of the stories are engaging, but as Culhwch said, it may turn some people off.
As of right now I still think they will succeed in putting everything together, but it is something that they will probably have to consider.
A thought: They could tell the other side of the story in Mereen, focusing on the Royal Houses (not sure if this would pan out for better or worse).