I have had these feeling at times. It is just the older you get, the more revivals we discover. Everyone though has such different taste in Musicals so I am learning to look beyond my borders, for something more substantial, to entertain me. If I wanted to see re-runs over and over again, I'd just subscribe to Showtime.
What is difficult for me is when your variety is limited and some shows seems to go on...forever. I don't think I will ever tire of Musical Theatre. Luckily, if I feel blue, I can go and rent something obscure or one of my favorites and buy it, for comfort. If I just have to get out, at least now I can get on a Plane. I can go to Places like Toronto and New York, where they are still giving stage space to those inspired artists who are willing to bring a new story to life.
I think what may be the trouble is finding something you enjoy that is new or newer. We all suffer from that. It is why I keep asking for more recordings of popular shows. Relying completely on Hollywood doesn't seem the smart way for Theatres or Composers to go to, to expand their audiences or make more money off of a quality performance. It just has been limiting and keeping out quality Performers from showing us what really is the best in Theatre.
I don't mind Musical History. I am happy we have it. I think we suffered some because genius' are difficult to come by. Almost every composer has a flop now and then. A few new examples are emerging though, so hang in there. If a few musicals can't make you happy, you need to get out more.
Thanks for the suggestions too! I am always happy to find some new entertainment.