Here's some information:
A. The general discussion forum was the greatest draw of traffic for Massassi even during its prime. The ability to discuss topics outside of editing is important to maintaining an active community. Otherwise, you might as well just have a wiki.
B. I'm not aware of any "Massassi-type" issues. In fact, Massassi is still more active than JKhub.
C. This new site looks centered on the multiplayer community of JO/JA, instead of modding. We all know that the community is essentially dead, except for the usual leftover nostalgic members, as you'd see with any dead game. It's sad, but that's life. JO/JA were never as popular as Jedi Knight were, and Jedi Knight wasn't as popular as Dark Forces, and Dark forces was never as popular as Doom, etc.