I think that's because Telltalegames got their own MI-forum. And there have been a LOT of activity there.
I'm an oldie too, btw. 12 years when I registered. Haven't posted here since the prime time. Good times.
Edit: Huh, I thought i joined in 2001, but that was wrong. I was 11 years when I joined, then. Whoa, half my life has passed since then.