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When have you ever needed competitive-level Pokémon to beat the game?
Them focusing on making more natural-looking environments would be a huge thing for me. Everything is still arranged in perfect rectangles (with soft edges as of gen 6) and the grid the world is based on is still painfully apparent. Nope, you can't walk on this rectangle of slightly darker glass, because we say so. XY and ORAS have started to explore outside of the grid itself a little bit, but with the hardware they're on right now, there's really no reason too keep the grid at all, other than complacency.
I've probably mentioned hundreds of times how I'd like them to rethink the battle system, but it's not like that's going to happen.
Agreed on XY's soundtrack. It was their first try with orchestrated music, and for that it sounded great. It was grand and definitely set a feel for Kalos. It didn't have much character, however.