Honestly, I wouldn't say that TFF is over. I was part of a massive RP back in 98-05, we literally made billions of posts in that time.
Real life intervened, we all drifted apart, it seemed dead- 10+ months between posts.
And then, slowly, as we all necro'd old posts just to say hi and talk to those who might check the forum in 5 month's time... slowly, it started picking back up.
It's sure as hell not like it's heyday, not in the least because all of us are adults with jobs and/or children now instead of school/college kids, but the RP has picked right back up around '14, and it's just as fun.
If there's community, if there's friendship, a forum can last forever.
TFF will tell us if a forum can last forever if it's made of a community amongst fuckwads and an overarching hivemind.