So if Henry is asking for more money and control and WB doesn't feel like giving it, the unfortunate reality here is that he could be replaced too. One of Mario's previous articles mentioned Andrew Garfield, and I feel like that's a good comparison for the precarious situation Henry and WB are in right now; Andrew had a very strong and passionate fanbase despite the Amazing Spider-Man 2 getting panned by critics, but when the film itself underperformed and threw Sony's plans into disarray, the studio was able to replace him with a new actor who people were immediately able to accept just as well. In fact, possibly more so, given that Tom Holland's first Spider-Man movie significantly outgrossed both of Andrew Garfield's, and let's not even mention how people reacted to "Mr. Stark, I don't feel good..."
So like I said, I'm hopeful Henry and WB come to an agreement and I still think it's likely. Like Da-Scribe mentioned, starpower is really no longer a thing in Hollywood so it's not like Henry is guaranteed a huge gig anywhere just because people liked him in Fallout, and of course he does have an obvious passion for Superman.
But if things get tough and neither side budges? I could absolutely see WB replacing him and not losing any sleep over it.