I agree with the person that mentioned the power creep... It happens to everything with a growing meta (whether its tcg to video games)
Give underused pokemons something to make them more appealing...
That said I dont think mega evolutions will be that great because the trade off is 1 item... Since we havent seen any of the new items its hard to judge whether or not mega evolution is just a gimmick or a staple
I'm kinda wondering if this is them stretching the truth. Kinda how you can't get M.Blazekin in game unless you get the event. Like there are M.Evos for them just you can't get the items in game, therefor, "no Kalos Pokémon will have a Mega Evolution within Pokémon X & Y."
.....said an almost 30 year old married guy driving a van part time for a living 3ds my fc, 0602-6823-9646, my wifes 0146.9112.0071
If a third game comes out (like Pokemon Z) I can see them adding Kalos and more Megas. Over all, the first two games a gen seem to be testing the waters and seeing what the fans like so they know what to bring to the table next.