I have no problem with buying three, four or even six Superman titles a month.
I see no reason to change each one to be a different continuity...
The funny thing here is that if there was only one Superman title set in Post Crisis continuity right now the rant would be "why can't DC just make another title that takes place in the SA??"
Another funny thing is that this is something I suggested to some HEAT fans a while ago.
I told them to write letters to DC asking them to give Roy Thomas an ongoing series set in Earth 2 Pre Crisis continuity (at the time that was their rant).
To you I say, write letters telling DC to give Mark Waid his own BR ongoing set in its own alternate continuity.
There's NO reason to later the three ongoing titles... although I do like your choices as they would make sense considering the origin of the titles (Ad was originally Superman in the SA, current Superman was relaunched for Byrne and AC is a no brainer).
Even so, there's no reason to make a change.
Why change what's already out there when you can add to it and make everyone happy?
Marvel didn't alter an existing Spider-Man comic to tell stories in a new continuity...
