The problem with that is the pvp playerbase cant support more than one tier atm, the pvp playerbase is just way to small. Even for 2 of them it would make que's longer, not to mention the work they would have to do with reborn/pro itself to make another ladder.
its overall a -1 for me now. Im full supporting a UU tier change in the future tho. (like a rotational format change every month or 2)