This will not be happening, no need to fix something that isn't broken. Apart from the minor hiccup the ride had earlier in the year with it's launch system (and TBH it was actually fixed pretty quickly all things considered) the ride has been pretty reliable for the most part. I'd say Superman would have another 10 or so years left in her before we'd be looking at a replacement or major change to the ride system. It's clear that Village have no plans to remove it given they are about to invest in a new station design etc for the ride. I especially would hope that they wouldn't go with Zamperla given all the issues that Top Thrill 2 has had since it "Opened"
If anything is going to ever be done to the launch, they would be stupid to go with anyone other than Intamin anyway.
As far as new rides go, I don't want to see Movie World get a new roller coaster for a while now. The ride lineup is very coaster heavy and I think they have all demographics covered (Kid's coaster: Road Runner. Family: Scooby, Kansas Twister, Wicked Witch. Thrill: Flash, Superman, Rivals and GL)
The park really needs 2 or 3 new flat rides to boost overall capacity, and not dud's like Doomsday. I personally would have loved to have a star flyer kind of attraction for the park, but with Trident now I don't think that's the best idea. Once they get a few decent capacity flat rides, I'd love to see them focus on the WBK area of the park and replace the nearly 30 year old Zamperla rides (Sam Train and Tweety) and give that whole part of the kids area a overhaul. That's what I'd be spending the next 5 or so years on for MW (Oh and please, a decent quality show to replace the train wreck that is HSD 2). Once that's done, maybe a replacement for Justice League depending on how they keep up with the ride maintenance etc.
For Dreamworld, I think the next area they will focus on is the Motocoaster after Rivertown opens. The ride stands out like a sore thumb as it is, and once Rivertown opens it will be even more of an eyesore. I'd say this ride has maybe 5 years left before it's replaced. The only other ride I can MAYBE see that closes before it would be Gold Coaster, but given it's a pretty simple design without any major issues it might last a while longer.
I think for 2025 though we will see more of the park cleaned up, which I think is really needed and the park is certainly on the right track for it. I'd like to see for 2026 an expansion to White Water World (Can we finally get the Lazy River?!) and maybe a flat ride for Dreamworld and then in 2027 I'd say we would be due for another major thrill coaster or hopefully a water ride of some description.
I think for WnW we will see a replacement hopefully for the Aqua Loop but I don't predict anything major as their line up is already pretty full. Sea World I'd like to see another Flat Ride for the park (one that is reliable) but probably not as thrilling as Vortex. A family thrill on the scale of a Zamperla Nebulaz or similar. I don't see them getting another coaster for the next several years.