Assuming they don't just restore it as-it-was (probably too much to hope for) I don't see why we wouldn't. I imagine we'll be inviting alts & whatnot for a significant period of time as we all find characters we haven't used in a while.
Yes, we will be inviting everyone back who was previously a member/friend/alt. Of course those who haven't played the game in 6 mos to a year will be gone and if they do return, will probably think they were gkicked.