I think that it's a quite good idea to try to establish now a single point where to concentrate all discussions, etc.
Of course if at the moment there is not enough 'talk' about Nemo or Jolla (and I mean serious developer-level talk, not "I wish Jolla-phone has capability X") there might not feel a need for such forum, but I'm afraid that if this kind of things gets delayed, Jolla will build its own site, and Mer/Nemo its own, and Cordia its own, and the chance to unify the talking arena will be gone.