I don't think we'll ever see a park like that again. At least not for a long while.
IMO, the best course of action is to follow Tokyo DisneySea's model, where "original" lands are filled with IP rides.
That kind of defeats the point of using IP. And, IMO, your examples don't line up. In TOT the IP is secondary. Splash doesn't push itself as an IP attraction, and the only reason Popeye is there and not the Looney Tunes is because the CEO of Universal at the time was a cheap SOB