What does it even mean to claim that there are 'too many' RPGs in the marketplace?
If an RPG is successful, it will survive in the marketplace. If it survives, then there is obviously an adequate demand for it.
Personally, I am quite pleased to see the wide range of FRPG options available these days: WFRP, HARP, D&D, Conan, C&C, Angel/Buffy, True20, Burning Wheel, etc. If there exists adequate demand for these different products, there are not 'too many' of them.