Support for Riak is available commercially (we at Erlang Solutions are a support provider - and were a Riak reseller) and there is a decent-sized community that will step up and ensure Riak survives and evolves, I'm sure. For instance, there are at least 3 significant Riak users working on their own open source reply action layer ATM...
Wow. I did not see this one coming. Does anyone know if there are any major forks of Riak currently?