It all depends on what you grow up with. We are creatures of habit.
I adored Gold Silver and bought Pearl, but didn't play too far in. I just need a good excuse to get back into it so if X Y gives us a thriving, living world to be apart of and lets you customize stuff like crazy (basically make it a huge Animal Crossing), I'll probably put some time into it.
I do really wish they would change the fundamentals of combat, but as long as they have a speed mode that lets you finish annoying random encounters in five to ten seconds (given an imbalance of power in your favor) I should be ok.