I'm still kind of wishing for a storyline where they use the Flash's universe-hopping powers to bring different DC screen universes together. Maybe a crossover with the '90 series; maybe in a few years a crossover with the feature-film Flash played by Ezra Miller. Maybe a crossover with the universe of Berlanti's Supergirl if that goes to series. Heck, bring in Gotham, Constantine, whatever. Maybe even visit some older DC screen universes. What are Lois and Clark up to these days? Maybe visit a Lynda Carter Wonder Woman who gave up her Amazon immortality decades ago.
One part of me loves these ideas....another part of me is reminded of Earth Final COnflict, season 2...where each episode in the first half was a sci-fi cliche
Also, i guess that would get around your problem of having the movies & TV shows in the same universe (though i still contend what happens in the movies does NOT have to affect the storylines on TV or vice versa)