I think I would be happiest seeing as close as possible to a "completely authentic" production. I know that sounds odd with a fantasy, but it's in the reality of a town like Brigadoon ever existing that I find the most magic.
If a Scottish theatre company were at the center of it with Scottish musicians, authentic dances, etc., and a set that looked as much like a real location as possible, I'll bet it could be great. Then cast two well-known New York or Hollywood actors as Tommy and Jeff (and another as Tommy's fiancee Jane at the end), and sell those tickets!
I'm just afraid that if this show is given any kind of "Broadway gloss," given the suspension of disbelief already needed for the plot, it wouldn't stand much of a chance. Audiences today would find it too corny and contrived.
But give it a realistic, simple, but entirely "authentic" production, and I think it could work.
"Jaws is the Citizen Kane of movies."
blocked: logan2, Diamonds3, Hamilton22