If player's want the old lobby so much, why not upload the og map as a download, so people don't have to ask to bring it back, and can have full access to it, without lag?
I know it's going to not have the plugins or anything, but it will give them what they want in a sense, and can have a chance to explore it, because I've actually missed out on a few things on the old map, as a friend pointed it out to me on the kk remake, one of the breakable cobbles.
People who really want the old map, can just look at it on their own time.