I don't watch much boxing nowadays, and if I do, it's usually just highlights due to lack of time, but Fury Vs Usyk is the fight I wouldn't mind staying late for and watching in full. Both are undefeated (you could argue if that's still true for Fury though), Usyk is technically far better but has a size disadvantage. He handled Anthony Joshua really well.
Thinking about that, it makes all the sense in the world for Ngannou to stay in boxing. It surely means bigger payouts for him, and it brings a lot of people back to watching box. Usually, in recent years, we've seen a unidirectional outflow of fans from boxing to mma, but now this could be reversed, even if only temporarily. The potential problem would be boxing federations not wanting to let unranked Ngannou fight with the top guys, possibly for the belt.