I think that the movie "Tombstone" re-vitalized the town's tourist trade, as well it should have. A lot of the "new restored" look of the place comes out of that film (which, by the way, was very accurate historically, as far as most movies go).
The O.K. Corral fight scene was highly accurate - but much of the rest of the movie was typical Hollywood hyperbole. Read Casey Tefertiller's excellent biography "Wyatt Earp - the Life of a Legend" for a somewhat different picture of how things went - chiefly, that the Cowboys had more backers in town than the Earps, who after the shootout were considered the villains and had to essentially flee for their lives. Also, the scene at the end of Tombstone where Doc kills Johnny Ringo is sheer Hollywood invention - no one knows how Ringo died.
I still like the movie - it just isn't too realistic. I guess Hollywood thinks the real story is boring, since they've never told it correctly. ;)