I think if a performer was key to the show's success- then yes. Example- If they had toured the recent GYPSY revival, Bernadette Peters should have been Rose- no question. Sometimes though, you must respect the performers desire to move onto other projects- if they are available.
And if she'll say, "My darling, I'm yours!" I'll throw away my striped tie and my best pressed tweed, all I really need is the girl...