The only LJ comm I know of that is any where near active is xenites. So yea I agree. I think its a shame that Xena/Herc fandom is quiet, but I wonder if that is because there is no interest, or no where to really discuss it?
I would def join if you set it up. I know of 2 other Xena fans on my flist, don't know whether they would join but they might. I'd share walls, screen caps, eps that I pull, icons, fics... :)