The Brock Lesnar drama looking back on it is probably what did it. There was a decent group of fairly well informed fans who really followed the sport on the board, and then when Lesnar came, there was a ton of wrestling board crossover. That created an elitist sect lead by KingDomer turning every thread into a flame fest. People got banned, people left, and this place died. I didn't like KD, but when he was gone, this place fell off hard. Also once whoever else was helping with the fight card threads stopped that really killed the activity.
The vesty has threads usually for cards, however it's a little too fast passed for me. I use the SB nation mma sites now for my mma discussion fix.