A black actor as Clark Kent could be interesting. My chief concern is I want this to be about Clark Kent/Kal-El. As long as the characterization is good, the screen play and directing are good and the actor embodies the character well, open casting should be considered. It's not visually what we are used to, but as long as it's Clark, I can roll with it and give it a chance. It may turn out great.
If it's a character other than Clark, I'd be way less enthused.
Also the creative team behind is giving me bad vibes. Even if it was partially out of his hands, Abrams' last film was a disaster. I'm not familiar with Coates writing, but what I hear of his Black Panther run doesn't fill me with confidence. I hope he doesn't have Superman ignoring rape camps like he had T'Challa do.