One of the big interesting thing this article completely forgets is that with the rise of the social-media-driven bucket lists, tourists, especially the ones from far away, tend to congregate in a few places, in countries where there is a million things to see.
This is especially obvious in France where American tourists only go to Paris and Nice (and a few other places in the south), leaving the rest of the country for us and our Dutch, British and German neighbors ;-)