I would consider South Pacific to have been a hot ticket. However unlike other shows that fit that category, you really can't judge its success due to the fact that it is a non profit show and has no grosses.
It was a show that was hard to get a ticket to when it first opened. I remember wanting to see it so badly that the only way I could get a ticket was by using graduation gift money to buy a full price single ticket and the closet date I could get from when I ordered was a month away.
Yes, There was a buzz around Hair and people were flocking to it like hot cakes (which is why I feel it recouped as fast as it did). I do not however, feel that the cast change has anything to do with it closing. I think that it is not making money because it was hot for awhile . But, everyone who has seen it has seen it and are moving on to other things.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll