At 1,000 seats, the Belasco would have been economically unfeasible for Brigadoon. It would need one of the houses that are 1,400 seats and up.
Follies was produced on a LORT contract and closed as soon as it would have had to convert to a full production contract. Though it had a lot of set, Dracula only had about 18 cast members and an orchestra of six, so had it been a better show, it could have made the economics work.
The Belasco actually has an incredibly deep trap area, so a lot can be accomplished scenically, but at only 1,000 seats, it's a difficult house for a big musical.
Begin at the beginning and go on till you come to the end: then stop.