This is a solution in search of a problem. There isn't anything wrong with the current system and I don't see anything that would suggest it will be a problem after we get usage stats for UU and subsequently NU. Who cares if NU is gigantic, there are so many pokemon that it should be expected to be huge (especially when we start talking about NFEs). IMO that would make it a much more fun metagame.
NIGMAN: JRRRR IS A SHIT
NIGMAN: HO ESLE THINK IT??