I mean, like, it could've been the MVC coming in instead of the Nasties. They'd be gimmicked up somehow, I'm sure, but that would've been a gigantic upgrade and I don't think Vince ever looked at either of them until way too late.
Production-wise I think everything would stay the same but honestly all of the in-ring rules he had in WCW are almost exactly what Hogan or Warrior worked within all the time, and I think Savage would get grandfathered in when it comes to top rope stuff. Bret probably gets pushed harder. A POC might crack the main event in a meaningful way somewhere (even assuming it's busted up JYD). The people who he hated or who would feel alienated by his hiring all could've had better runs elsewhere for a while. I mean, it isn't like things would be worse for anyone.
I dunno. Watts' style was kind of the backbone for wrestling ever since. Just don't let him have full control. I bet he could've booked the perfect Rumble.