I believe it has been confirmed on the board that Collette was all but set to replace Richardson in CABARET but Equity did not allow her to do it. A real shame as I imagine she would have been as definitive as Richardson.
It is also a shame we never got to see her Roxie Hart, another part she was all but set to play until Harvey brought in Zellweger (who was divine in the part).
Then there's that blind item that came out around the time the SWEENEY film was being cast indicating that she had gotten the role...and then that didn't happen.
And who can forget the time she was offered to play Mrs. Wilkinson in the BILLY ELLIOT transfer and she had to turn it down when Showtime picked up US OF TARA?
That's 4 wonderful roles we didn't get to see her in. I adore her and wish she got to play all the great musical theatre roles. A MAME starring her would be out of the world (she practiced with Tonya Pinkins singing "Best Friend").
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"