Who knows, maybe there's a thriving community of RAGE fans in other unknown forum websites
Take the Witcher 2 as an example, CDPR wanted to revamp their forums so it was unavailable for a very long time, but fans managed to find their way to the BioWare forums in the off-topic section for Witcher 2 related discussion, i think even CDPR's writer payed us visit.

Once RAGE is nearing its release or after its release, fans will be flooding this forums.