No, please re-read.
What I am saying is exactly what I said, that "most new musicals are not good."
Most new musicals (whether mounted in the golden age, now or at any other time), are bad, and most fail. Most of them never make it to Broadway. If you look at the number of musicals (or plays, for that matter) that do make it, most slink away with no afterlife. Count the number of new musicals that have appeared on Broadway in the last hundred years. Now count the number of discrete musicals that have been revived. This should help you understand my point, and also the point made in this thread that it is harder to put on a new show than a revival because a revival comes with its parts in working order.
Most of the shows this season will never be revived, just as most of the shows from 50, 60, 70 years ago are never revived. Some seasons there may be 2-3 shows that will survive; this year, we have one.
It has always been thus. Do you think there were only 10 playwrights in the 16th Century and that 99% of the plays written were by the same author? The cream rises to the top and things like Finding Neverland are fed to the swine.