I think something to keep in mind is that NWN2 is but one game, and that there will be more from Obsidian and so a more expansive or vibrant community. That may be a while yet, and losing the NWN2 forums definately took a big wind out of the forum's sails, but it is only temporary.
As for the lack of a replacement forum, Obsidian have been extremely busy; the move of the forums also coincided with their passing of a "major milestone" in NWN2's development, so the resources for tending to these boards just haven't been available.
Essentially, we've got to be patient. Just think, you'll be able to reminisce on the forums in a few years time about The Big Move of '05 and how you were there and witnessed the blood and tears.