I personally find this very problematic.
In my current Facebook community, I have a policy that whenever somebody gains access to a restricted space (we have a bunch of Messenger chats with various subgroups to manage things, plus a secret admin facebook group on the side), they do not lose it even when they “give up” their role.
Being in a smaller, “behind the scenes” subgroup makes people bond, and this is also valuable for the community, and I don’t want people to “hang on” to a moderator or helper role because they don’t want to lose the feeling of community they have in that small group. I find it a bit brutal if changes to one’s activity in the community (for whatever reason… it can be lack of interest but it can also be “life happens”) result in being socially outcast.
So people can stick around. Of course they are free to leave if they want to. But usually they don’t. Unless there is conflict, of course, I don’t feel comfortable cutting people off from their contributions and a space of social relationships.
Much as I like the idea that people “automatically” appear in the lounge when they reach TL3, for the moment I’m reluctant to activate it for my community because of the “automatically disappearing” part.