General discussion about the game has certainly died down of late. I noticed this myself before this thread had been opened. Discussions about Div Div however do seem to be still flowing well.
I think it was a sign of things to come when the DD2 Threads and questions started flying about so soon after BD was out. Sort of like "Well, BD's fine and all, but lets not talk about it anymore! When's the next game coming out?"
The most active threads being either the 'I hate StarForce' or 'It's not DD2, where's DD2?'
Unfortunately as well, there seems to be some sort of anti-BD pro- other club going on where any area of BD is called into question because it's not done the same way as in other. That kind of kills discussion too as say a question like 'What's the story like in BD?' Answer 'Well in other it's much better because...blah blah.'
This discourges further discussion on that topic without actually telling anyone what the story is like.