Whether it's his Charizard, Sceptile, or Heracross do you think they will struggle with Mega Evolution likes Korrina's Lucario?
Personally i think Ash getting Mega Evolution is a guarantee - they've introduced the concept reasonably well already and it just seems like a matter of time for XY as it gets further into the anime where Ash will finally have episodes revolving around him getting a key stone, a mega stone(s) and the episodes around that.
I don't actually think Ash will have any problems like Korrina but obviously this is kind of a 50/50 thing. My main wants are that Ash uses Mega Charizard Y and Mega Sceptile. He may only get one Mega, or he could get a lot (including the worst, Mega Heracross).
Time really will tell really. I'd say any of the major Mega Evolution areas in the games are where Ash could get his own stone(s) so this could be Shalour City or Anistar. Even Sycamore at Lumiouse could help Ash out once they return.
I think Satoshi can have some minor problems with mega evolution but not as serious as Corni's such that her Lucario out of control. He should get at least one and at most two mega Pokémon I guess.
How obvious is that going to happen? I see Jukain is the other choice for the mega stone and I am sick of Lizardon everywhere in the anime.
Remember Ash could very easily get a Key Stone at Shalour City just like in the games meaning he will have started his Mega Evolution journey still early into XY.