I truly believe Beauty & The Beast would have run longer.
I also think Ragtime & Billy Elliot too.
I remember when City of Angels (or was it Will Rogers Follies) closed and the times did an article about how it decided to close early to keep them wanting more. And it was actually a good idea instead of overstaying it's welcome.
"Whenever I get gloomy with the state of the world, I think about the arrivals gate at Heathrow Airport. General opinion's starting to make out that we live in a world of hatred and greed, but I don't see that. It seems to me that love is everywhere. Often it's not particularly dignified or newsworthy, but it's always there - fathers and sons, mothers and daughters, husbands and wives, boyfriends, girlfriends, old friends. When the planes hit the Twin Towers, as far as I know none of the phone calls from the people on board were messages of hate or revenge - they were all messages of love. If you look for it, I've got a sneaky feeling you'll find that love actually is all around."