I saw that piece in the Times yesterday and basically agreed with it.
Though I couldn't believe, in the comments section, that someone suggested Mark Selwyn's "Broadway Babies Say Goodnight" (the subtitle of which could be "Musical Theater Would Be Terrific If It Weren't For All The Faggots") in the same sentence as "The Season"!
You should give Ethan Mordden's "Broadway Babies" a try, too. It's almost seems like a warm-up for his seven part series, but it's a very good book in it's own right. One thing about Mordden is that when he loves something, he makes you want to go and see it or listen to it too.
A book I just finished re-reading for the umteenth time is Helene Hanff's "Underfoot in Show Business", a wonderful book about trying to break into theater (and being broke) in New York in the 30's, 40's and 50's.
"A coherent existance after so many years of muddle" - Desiree' Armfelt, A Little Night Music
"Life keeps happening everyday, Say Yes" - 70, Girls, 70
"Life is what you do while you're waiting to die" - Zorba