No not at all, I have tons of friends outside of the LLC. I guess if you don't get involved and branch out then that could happen. But I can't think of a single person in my LLC that doesn't have friends outside of this building.
It's not hard to get in, no application or anything, you just indicate on the housing signup that you want to live in an LLC. Not 100% sure but I think it's a first come first served kind of thing, so do not wait, try and do the housing application the day or a few days after it comes out at the latest. The LLC's are getting more and more popular so I assume that they're going to start filling up faster.