I actually enjoyed Betty Grable. She brought glamour to the role, whether it was needed or not. I still remember the audience reaction when she sang 'look at the old girl now, fellas' as she raised her dress to show off those famous (and still beautiful from the second balcony) legs of hers. I was very disappointed with Martha Raye (and Ethel Merman for that matter -- the voice was still strong, but the acting was just something to get through...just like Annie Get Your Gun at Lincoln Center). I could not bring myself to see Phyllis Diller; after all, the balcony was probably $4.00 by the time Diller joined the show and I had better things to spend $4.00 on (plus, I lived in Jersey).
Now, re Audra as Dolly, I really hope not. The only reason -- I am sure she would be great -- is because I want her to be the big enough star to finally open Mame. I want Beanie Feldstein to be Gooch, and have several candidates in mind for Vera, e.g., Jenifer Lewis, Patti Lupone if she decides she doesn't want to have to carry a show anymore. To the person who said that Audra can't do comedy, her very first Tony was the comic relief role in Carousel, Carrie Pipperidge (sic), for which she also received delirious reviews from critics who did not know her at the time.