It's playing to a really high capacity considering how long it's been on Broadway. Hell, it's even passed most of the newer shows in it's percent capactity. I think it still has a few more years in it.
"He who falls in love with himself will have no rivals"
-Benjamin Franklin
I went to The Phantom of the Opera on Monday night to try and get $20 rear mezzanine tickets with my friend, but they were completely sold out. I'd say it still has a few years left.
Perhaps it just isn't new to you anymore. I saw it for the first time in February and I thought it was spectacular. You're just probably no longer amazed by it, since it's been around for almost twenty years.
Oh no! What if they stop on the EXACT same number of performances that Cats did, freaky! How long did cats run? At the Winter Garden right? how many years...
"Needless to say the crew is well acquainted with my ass and that's ok because they are the coolest guys ever."
- Idina Menzel
There's no question it's going to pass Cats. I saw it last a year and a half ago and even at that point, one of my students asked an usher how long it was going to run, and she answered "we're at least going to beat Cats..."