Look at the hip hop section. When I regularly posted here, it was always bumping with tons of good discussion. It has had a mere 11 topics posted in today, and the topics on the 1st page go back a week. That's pathetic.
Eminem is the biggest rapper alive, and has the most fans by far. The is the first forum that comes up when you google "eminem forum". There is no reason it should not be popular and have tons of posts. The admin has really hurt the site, no other excuses.
Kanye is significantly less popular than Em, but look at KTT. It is well managed, well organized, and has tons of posts.