well, you're still "supplying" them, by specifying in the theme.rc exactly which module AND version is downloaded. so you still have as much control over that as before. of course, anyone can go in and change it, but there's nothing that can be done about that, and that shouldn't BE changed, anyways. the bandwidth issue could be annoyance to some dial-up users, but that's about it (oh, and possibly module hosts).