The whole issue is ridiculous with WB.
Arrow = can't reference Gotham City at all, long before the series was developed.
Flash = direct Wayne Enterprises reference in the pilot.
How did they even get permission to do a Flash series with WB knowing he was basically the #2 lock for a movie after a Batman reboot.
Superman WB really shouldn't worry about, movies will always be a better fit for him than tv. You don't lose much with a tv Superman.
Batman on the other hand makes sense, Arrow(regardless of acting,writing and season 3) proves Batman can be done absolutely perfectly on tv and not require a movie for very much.
Gotham adds to that as a near perfect representation of Batman's world.
If Gotham or Arrow were Batman other than Batman vs Superman or Justice League why would you even really need to go out and pay to see a 2hour Batman movie with an hour of Batman every week.