In the past I've said enough already, lets have something new. But thinking on it the Borg are one of my favorite villains, I never got bored with them like I did the Klingons. kingDaniel's point about looking better (and scarier) is a good one. I'd like to see them again.
I agree. The Klingons can stay in their mothballs of honourrrrrrrrrrrr for all I care, but if JJ wanted to bring back the Borg, I'd be all for it....as long as they're really threatening, like they were in First Contact.
If they have to recycle villains, let them pick the good ones. Of course, ymmv on who's a good villain and who is not....