Yes, we have things like Earth One and Earth Two (at least for now), but what about all those other worlds they created? The Charlton universe? Or that pulp universe? Or Earth 32, the home of Super-president? Why create these worlds if you're not going to do anything with them? Just for Morrison to play with? I'm sure nobody wants a sequel to Kingdom Come or New Frontiers but there are plenty of "corporate" Earths they could do stuff with. As someone else once said, DC has a problem with letting others play with Morrison's toys but they aren't really his.