I would retheme Soak City,. The current theme is just bland. They could do some awesome things with the water park. I would actually like to see them operate as two parks but I doubt that will ever happen.
I only rode it a few times when it had the OTSR. The line was almost always short when the ride had those. Once they were changed over to laptop bars it became one of my fav. rides.
I would much rather have a B&M coaster sitting there than anything Intamin would build. While B&M coasters aren't as intense they seem to have way better capacity.
I think part of the reason the way Soak City is because there are some massive power lines over head. I would be willing to bet that code prohibit the park from building a water attraction underneath them.