A big amen to iSm's theory of vague storyline as being more repeatable. I have long held this to be the case. Open-endedness allows the imagination to run wild, but narrative specificity can really put a stopper on it.
The media-based attractions are probably the best example. HISTA is very specific, and not very repeatable. Once the surprises are known, there's no reason to go back. Even Star Tours gets old, once it starts to seem like a film you watch while being flounced around, rather than an actual journey.
I think one of the key elements to the endless repeatability of Pirates and Mansion are their open-ended non-narrative nature. They are atmospheric, with individiual little moments of humor and character,but no forward narrative drive. This is a good thing, as it allows one to simply relax and wallow in the moment. Once there is a strong narrative pull to "get to the end" of a story, everything else becomes something to get past, not something to linger on.
I don't know how much the changes to POTC and HM will alter their non-narrative feel, but I can see where this kind of thing can shortchange the experience a little if they aren't careful.
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