Y'know, in an ideal world I'd love to see a DC cinematic universe and a DC TV universe, all superb quality and all seamlessly interconnected. But WB/DC are still concentrating on hitting the right notes with their movies, never mind trying to expand that universe into TV as well. Plus, I've seen Marvel accused of just paying lip service to the whole 'it's all connected' thing, in that events on the TV shows have no significant impact on (or even a real connection with) what's going on on the big screen. As I understand it, the longer production time for movies compared to TV makes that kinda unavoidable. TV shows can reference what goes on in the movies due to their quicker production time, but it's hard to do it the other way around. Any 'connection' is really a one-way street.
Plus, there's a quality issue. I admire the world-building that the CW have managed with the Arrowverse, and I've enjoyed some of the crossovers. But seriously, any TV shows that were to be directly connected to the movies would have to be a big step-up in quality from that. I admit I haven't seen Titans or Swamp Thing. Are they much better? I hear Titans is pretty divisive.