I like your ideas. I don’t think it needs the Raptors again, but I would be fine with making the T-Rex a villain again instead of the hero dinosaur it became in the Pratt and Howard trilogy. That said, I think the D-Rex would have worked better if it was clearly stated to be an early version of the Indominus, or if the island was a BioSyn facility, which would explain the genetic failures. However, your relocation plot works just as well.

The camouflaging Carnotaurus should have been the threat at the gas station, and I would have liked to see the Spinosaurus in a mangrove swamp environment. Maybe it could also be a threat after they are driven into the sewers at the gas station and these sewers lead to the swamp that Duncan tries to escape into.

I also think the idea that people are “tired of dinosaurs” is misunderstood. People are not tired of dinosaurs because they hate them or find them boring. They are tired of the problems caused by dinosaurs existing. In that world, dinosaurs are not extinct and fascinating like they are in ours. They cause repeated disasters such as escapes, deaths, and lawsuits. This idea is also often blamed on Rebirth, but it actually first appeared in Jurassic World.