So this is interesting:
https://www.cbr.com/batman-joker-movie-connected-rumor/
Why create a secondary universe? We know that the proposal for the Flash movie was originally going to be an adaptation of Flashpoint. Whether or not that's still true, I don't know. It seems odd to create two separate universes unless they want a "back up" one in case the DCEU doesn't take off. Having an older Batman in comparison to the much younger JL does create it's own set of problems down the line. A separate universe for a younger Batman would let them try to recapture the magic of the Nolan movies while still opening the door to introduce other characters later on if they decide to just cut their losses on the DCEU. It's obvious they want their own version of the MCU and this might be their second attempt to get it by going the same route they did. One character movie at a time. What do you think?