Re: How long should the new series go on for?
W/F (since it doesn't look like they are doing a proper sequel this time)
WW (this can be made while someone else is working on MOS3, giving more time for the scripting of MOS2)
Batman Arkham solo movie, with JL teaser (and like another poster said, he should drop out from cinemas for awhile)
THEN solo franchises afterward based on audience appeal
AA style movie
Various solo movies.
I absolutely think WW needs to happen before a JL movie.
In that case, maybe
MOS2 (with WW teaser)
MOS3 somewhere in there.
So yeah, that's only three films before a JL movie. 4 if you add the Flash somewhere there. That's adequate, IMHO, but isn't rushing it like W/F then JL right after would be.