WB waited to see if Man of Steel was going to make a profit. That profit it made was going to determine if they wanted to go ahead and start a DC cinematic universe. Steel was always going to be the film that determined that.
And gee whiz, Mos made a big enough of a profit that WB feels comfortable in going and further starting a DC cinematic universe by throwing Batman in the MOS sequel.
All this talk about MOS being a game changer ? When was it ever going to be a game changer ? The only thing the film was going to be, was the deciding factor if WB could start a successfully profitable DC universe.
Like the direction WB is going or not, it's irrelevant, we are getting a film with Batman and Superman in 2015 and WB is going to be laughing it up, ROLLING IN DAT DOUGH