I don’t plan to spend too much time over here but I think this is a good general solution.
Imo this is unlikely to go over well receptionwise or BOwise, but there is some room for the specific execution to go over better than expected. People have been thinking that this might wipe the Snyder stuff from canon for a while, and Batflexk being done is expected, but transitioning to a no Batman+no Superman model is… unexpected.
Also if we’re erasing movies from continuity with a one-shot story gimmick, should have erased WW84 😛