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There's just way too many Pokemon at this point and this hurts the series in several ways.
By Gen V they couldn't be bothered to make new sprites for all Pokemon so they just animated the Gen IV ones for existing Pokemon. Now we have the XY 3D models and going by what some anons have said, these models have ridiculous number of polygons (resulting in the slowdowns we get on 3DS) which may indicate they were designed to be reused for a long term.
Then there's the problem of too many legendaries. If ORAS is any indication they're just going to simply distribute the older legendaries with very little backstory or lore. They can't possibly make up individual ingame events for every single legendary trio now and they have to stuff at least 50% of all legendaries in a game within a generation to ensure you can catch all the legendaries by the end of the generation (first 2 versions, remakes, possible 3rd version)
They're scaling back on the number of Pokemon for each generation now as we've seen in Kalos, but one of XY's biggest flaws was too few new Pokemon which made for a less interesting generation. Megas are a way to introduce new things to existing Pokemon, but actual new Pokemon is what keeps the series interesting.
