But I guess that would have the same problem as Star Tours. It's clear that they are building a Marvel land in California Adventure, so having a separate Iron Man ride in a different park would be kind of weird. As you say, Star Tours is very easy to re-theme though. They can pretty much pick any other IP and turn the ride into something else.
I have to say though, even if Star Tours is a classic ride, I'm really open-minded about it leaving for good. It's a good ride, but these days we have technology that is a lot more impressive in terms of simulators.