This is how I see it
-You do Man Of Steel
-Then you do Batman Solo, announce the "shared universe" thing. Announce Ben Affleck will Star and Direct. Affleck right now is enjoying his second childhood of critical success, almost anything with his name on it as writer/director is going to get you a certain amount of prestige and buzz. This will help to distance away slightly from Snyder detractors, and also assure fans that a "serious" filmmaker will be taking Nolan's reigns. Have the Batman solo take place roughly at the same time as Man Of Steel did, you can either end the movie with Bruce amongst the wreckage looking up at Superman fighting Zod, or if you want to avoid cliffhangers, end the movie and then have the post credit scenes showing the wreckage and battle from Bruce's perspective. BOOM now you have the perfect set up for Batman Vs Superman
-You do Batman Vs Superman. Now that you have a standalone Superman film under your belt as well as a Solo Batman, you can now bring Snyder back in to an ESTABLISHED UNIVERSE. We don't need to see Bruce's origins, so that time can be spent on establishing Lex Luthor and his motivations to destroy Superman (keep Luther as someone who thinks that Superman represents the end of human achievement, someone determined to use his intellect against Superman's brawn to prove the superiority of Man) Also keep the focus on Superman's emotional turmoil over his place as the world's hero. Show Wonder Woman popping up to investigate the rise of meta-humans, introducing Aquaman, Cyborg, and Flash; her arc in the film, rather than as a glorified cameo as critics have claimed, will be as the third pillar that ultimately connects Bats and Supes with the rest of the Super Friends, you can even have Lois helping her which would give her something to do. They all unite in the end to stop Bats and Supes from killing each other and they all fight off Doomsday.
- Print Money