Its a new toy. After some time people will loose intrest and the sub forum will die. I'm not interested in themes and the fact that half of the threads are about them right now doesn't bother me. When we first got Addictive drums, or Melodyn it was the same thing.
The only good reason for a sub forum is so people could search the topic easier in the future.
But the same could be said for AD and Melodyn topics.