That's a good idea. A lot of people will be leaving in the summer, and restricted to one thread, it'll keep there from being too many threads.

Actually, I like this idea so much I'm for it for making I'm leaving/I'm back threads legal in general. We could make a summer, winter, fall and spring one (beause the threads would get too full after a while) and sticky them during the time they're being used, then after the season ends we unsticky them.