They can't take it from Sprint, since that's a CDMA phone. They probably won't take it from AT&T, since that's a rival. If they take it, it will probably be from TMobile.
But asking whether a company will carry a particular phone in the future is like asking to have your tea leaves read. We all read the same announcements that you do, so we can all make the same guesses that you can - and that's all we can do.