DRS i dont think will close for a while yet - still a popular ticket and grosses well.
Id bet on Beauty and The Beast closing - doesnt gross very well and for the past three weeks has only had 60% average capacity - think Little Mermaid will replace it for Spring 07.
Sweeny Todd will probably close at somepoint, In My Life, Chicago could possibly go (even thought i think this every year!)
As for Sweet Charity i hope Chistina extends as i love it with her in the show, infact i really love the whole show, its a really clever revival, great dancing, songs, script and set. I think if Britney takes over and it moves to The Hilton it will only be a like special two month run or something...i hope they find a real broadway performer and keep it running...
Not wanting to wish any negativity on any show....but you folks in New York NEED something to close soon, so that you can open up a space for "The Drowsey Chaparone". It's closing in LA this month and should be on Broadway. For once, I'm glad I'm a West-Coaster...I promise this will be a hit on Broadway!
I disagree with Jersey Boys and DRS and think they will remain open for at least another 3 years. I think In My Life, Chita Rivera: the Dancer's Life, and Souvenir.