Like most complex issues with multiple variables, the failure or success of a Broadway show is not easily analyzed. There are many reasons a show can fail. Everything from timing, talent, book, score, marketing, presentation, and pricing must be considered and that is just the tip of the iceberg.
For starters, you must first decide on your definition of the term 'failure'. Yes, recouping is important but many critically acclaimed shows did not recoup and some of these were ground breaking. For the sake of argument, let's assume the show is deemed to be a failure. Ticket prices may have thrown cold water on the audience rush but people will pay just about anything in good financial times assuming the tickets are in demand and the show is the hot ticket the producers hope.
In the case of YF, casting was somewhat of an issue. Bart deserved a chance to carry a show but certainly learned how hard it is to shoulder the burden eight shows a week for something on the scale of YF. More to the heart of the YF tarnish was the fact that show was meant to capitalize on the shine of The Producers and the book and score were not as strong as they should have been. Unlike the combined workshop appraoch of the Producers where many of the artistic team got to weigh in and make changes, Brooks and only Brooks held sway over YF and in the wake of the loss of his wife and with the rush to get the show on the boards, Brooks did not give us the strongest material.
Again, there are many other reasons for this show's lackluster results but if any one or two things can be blamed for the poor results it would be the strength of the material. It is unfortuante. Yes, Brooks has a large ego but any one of us in this business can say the same thing about ourselves. Mel's ego may be larger but he is undoubtedly a talented man who brought a lot of attention back to Broadway with the success of The Producers. Whether you believe that show was the second coming or not it certainly provided a much-needed boost to the Great White Way which means more work for all of us who work in the business.
"Always smile at your enemies. It will keep them on their toes"