Absolutely agree. BvS is the only movie that has a significant amount of Supermanning in costume, but not in intense situations. And that's pretty sparse too, honestly. I mean I guess JL isn't that tense, and he sure cracks wise in that one.
Which I know some fans don't like, but honestly, I got a huge kick out of it. "Is this guy still bothering you?" could have been written by Jerry Siegel himself!
So I want the next Superman movie to A) have Cavill and Adams, but also B) both introduce Supergirl and include Cyborg.
Why Cy? I just don't think he's getting a movie anywhere else, and I really like him. Plus, he works with STAR, which is definitely part of Kal's neck of the woods, so I think it could be pretty organic.
And give someone for both Kal and Kara to talk to while they're "on the job".