[adzii_nufc]

Its hard to push Superman without damaging the integrity of Supergirl though, sure the odd sporadic appearance would do no harm but a series regular or even another standalone supes could draw away from the show. To further explain damaging the integrity, look at the shambolic mess Arrow season 4 finale left itself in. Team Arrow vs the entire world's nuclear stockpile. Granted it was crappy writing but I didn't believe for one second Oliver Queen was capable due to the numerous appearances by The Flash and even more vital to that plot was John Constantine whom regularly deals with magic and death. If Clark Kent was to constantly appear you'd likely end up with the same criticism. It would make sense to have him in a passing the torch role, establishing Supergirl as an equal to the point she would never require Superman.

Again though, TV characters should never be written so far out of their depth the way Arrow just was in a shared universe. You know its bad when three of us have agreed unanimously that it was dire. Marvel have had their lower key versions though. Look at Cap: Winter Soldier, we're meant to believe Tony Stark and others just didn't care that Hydra were about to decimate the population. You just have to accept that stuff sometimes and it barely matters if the movie was actually good which it was.

Anything is possible though as above if they go for Flashpoint we may see a Thomas Wayne alternate Batman on TV that wouldn't damage the big screen versions in any way.