Absolutely a GREAT idea!!! I've been shouting out loud for an active comm or LJ for Jon, 'cause we all know a lot of ppl love him, and he has a huge fan base, but for some reason I don't know why there is no current comm for HIM. All the fansites are dated, and no one updates them anymore, which makes me sad too.
I totally support your idea, just let me know if your comm starts to run. will definitely visit, like, a lot! LOL