Seeing as Pikachu's cry has changed to it actually saying its name, I wonder if some day the rest of the Pokémon will follow. Probably not this generation, but I'd wager we'll see more "spoken cries" in a few games (starting with 'mons such as the starters, old favourites like Jigglypuff and the like) and some generic squeaks, ka-caws, growls and roars for many other Pokémon. Alternative Pokémon sounds would probably co-exist with the current cries for a while, before all old cries are eventually replaced with more realistic sounds. Though, this could take a decade or so, and even then it could be tested in spin-offs before making it to the "official" series.