I really disagree on this. Of all of the resorts around the world that people can visit, I highly doubt that anyone is "cross-shopping" Shanghai and WDW.
There always has been and always will be cloned attractions at different parks, and even "cloned" ones are usually unique in some way.
Duplicating attractions at multiple resorts gives people more opportunities to experience popular attractions.
To clarify -- when I say "clone," I mean a virtual carbon copy of a ride. To my knowledge, the Mine Train that's going into the Shanghai park is going to be largely identical to the one that's going into the FLE. (I think there was talk that the Shanghai version might be longer, but from what looks to be a relatively recent park plan, the track layout and queue arrangement appear to be identical. Obviously, if the Shanghai version turns out to be substantially different, then this argument doesn't apply with regard to that specific attraction.) I also consider the Slinky dog, parachute drop, and RC Racer attractions at HKDL and DSP to be clones, even though the Toy Story (Play)Lands they appear in are somewhat distinctive. I don't, however, consider Indiana Jones at TDS and Indiana Jones at DL to be clones, despite the fact that they share the same layout and same use of the Indiana Jones character.
My distaste for clones has nothing to do with "cross-shopping" -- I've assumed that the vast majority of visitors to Disney parks do not have the means or inclination to decide among multiple Disney parks to visit, especially parks on different continents.
But what potential Disney guests all over the world do have, to some degree, is access to information about other Disney parks. And, to the extent that people are aware that they're getting exactly the same thing that another park somewhere else got -- I have to think that can't be as positive a feeling as knowing that you're getting at least a variation of an existing attraction -- or, better yet, something wholly original. I wouldn't underestimate the power (both emotional power and spending power) that the pride of place and ownership can inspire in people who have a fierce loyalty to a park that can endure for decades.
I just think there are very few -- if any -- "popular attractions" that are so unique and also so intrinsically tied to their particular underlying theme that making them somewhat different would be considered fundamentally detrimental. How many potential fans of the Mine Train ride would be disappointed if the same swinging mine cars were themed instead to a different Disney fairy tale? A few die-hard Snow White fans, maybe, but if the new "mine train" has the same vehicles and a well-fitting, well-executed new theme, I think the differences would more than outweigh the fact that the attraction isn't tied to the Seven Dwarfs.
I'm not against borrowing themes or ride systems to make virtual or spiritual "clones," provided the new attraction is as well executed, if not better executed, than the original. TDS's Tower of Terror, for example, has a beautiful queue and ride building and a compelling backstory. (Whether the ride itself is an improvement over, say, DHS's ToT is another issue entirely!) But TDS's ToT is, on the whole, something that TDR locals can be proud to call their own. Had the OLC simply put in a literal clone of the DCA Tower, I suspect that some number of TDR fans would have seen their faith in and loyalty to TDR somewhat diminished. (And I'm sure that HKDL fans are happy to have gotten the entirely new Big Grizzly Mountain runaway mine cars, rather than a carbon copy of Expedition Everest, however much fun Everest might itself be.)
But cloning -- i.e., literally taking something that's in one park and "cutting and pasting" it into another one (as seems to be the case with the Mine Train, and potentially might be the case with RSR and DCA/DHS) -- is uninspired at best, and lazy at worse.
