In the event that this happens, you will submit a ticket, Prongs will
verify, and manually move the account backlook at the situation, on a case-by-case basis. No decision has yet been made about whether the account can be moved back to the universe if it violates the "top 20" rule.
Apparently Prongs and I had a miscommunication when I asked about this earlier this week. See the above for the actual procedure that will be undertaken (at this point). If you're concerned about it, just don't let your account sit long enough to get moved out. Unfortunately it's the best answer I can give you right now.