Being perfectly honest, if there weren't people I were friends with on the Guild I would have left about 3 years ago.
I've still mainly transferred to a more active community too though, but that's a lot more due to Guild Activity having shrunk since the old site died and me now having more time to kill as a result.

But yea, if you feel like you're better off leaving then honestly go for it. It's your life, do what you want. 
I'm assuming any worthwhile friendships you made on the Guild you would be able to keep up even after leaving anyhow.
Best of luck in whichever Internet community you migrate to. :)