It's always a gamble, when you build something that's never been done before. Will the people flock to it in droves, or will they think it stinks? Hard to say what's going to become a classic.
Although, it's easier to help an attraction fit the "classic" style if it's themed, designed and built with "the dream" firmly in mind.
That said, the other thing TDA needs to grasp is that they can't tack a revenue figure on each individual attraction. It's the overall revenue of an area that should be looked at, if at all. See, one attraction may or may not be a big money-maker. But, its presence, along with the presence of other attractions in an area make that area as a whole a revenue generator.
It's easy to fall into the trend of nickle-and-diming each individual little piece of the park to try to fine tune it into the most efficient money maker. That's the bean-counter mentality, and it eventually makes the whole thing soulless and unattractive, which eventually drives everyone away.
They need to really gamble and lay it on the line. Revamp and follow Walt's dream of that "vista into a world of wondrous ideas, signifying man’s achievements…a step into the future, with predictions of constructive things to come." Pay no heed to the short-term gain and the ultimate necessity of revamping again once history has caught up. It's the only way to do it right.