Oh, I don't think it will completely fade into obscurity. It just won't be a likely choice for a commercial Broadway revival. Like Grey Gardens and Caroline, or Change, it's a wonderful show that will be very popular among musical theatre fans and academics than be generally known by the public. They will live on through regional, amateur and college productions and in musical theatre history books.
"What can you expect from a bunch of seitan worshippers?" - Reginald Tresilian