One good thing at least is Henry Cavill continuing as Superman. Now if only they can de-Snyderize and retcon him a bit for future DC movies....
That's exactly what they should do, and maybe even do a cinematic version of COIE or a simpler version that warps reality, like Flashpoint.
DCEU needs a reboot because Snyder made too big of a mess of it.
A reboot/change in the timeline allows the studio to keep the few things that worked, like say, certain casting, (Cavill, Gadot), but fix other issues, (make Batman younger, maybe recast a few heroes, ignore stupid things like killing Jimmy Olsen).
If you want to make Superman look right to a modern audience, they need to sit down and watch First Avenger. Captain America was basically Superman with less power. The inner nature of Steve Rogers is not that different than Clark Kent. You don't need to do a period piece to make Superman work either.
You just need to write Superman in character. I thought Brandon Routh in COIE was very well done, but too brief.
Modernize the magic of the first movie.
And yes, I think that can be done in a supporting role. But the key is using the character well. One idea I heard was having him in Shazam 2, as someone Shazam/Captain Marvel has to fight because he's controlled by Mr. Mind. That is a stupid idea.
We already have seen Superman fight Batman (and lose because of stupidity). Then we saw Superman return from the dead and fight the Justice League. So now they would have him fight Shazam?
Here's a novel idea--how about Superman fighting actual villains?
If Superman is only going to be used to be a punching bag for another hero, that's never going to work.
No matter how powerful Superman is, he can't do everything by himself. Even if he could, the collateral damage would be tremendous without the other heroes.
I think the best use of the character will show his heroism first, the fact that he cares for everyone, his good nature. No mind control, no getting beaten up by anyone, just is pure goodness. He needs to be an inspiration, just like Cap is. The hero of heroes. And when it comes down to it--the big gun.
Darkseid has a whole army of supervillains besides Steppenwolf. Granny Goodness and her minions, Kalibak, and of course all the parademons. The Justice League can fight all of those demons while Superman takes on Darkseid in an epic battle. Darkseid is as powerful. And Darkseid is also as evil as Superman is good.
Darkseid can beat Superman unless he goes all out, and Superman rarely gets that mad.
If they did a story like Apokolips Now, it would be incredible. Superman won and still didn't win.