I agree with Kringas, one of the things that had everyone talking about was Murphy's re-invention of Phyllis. Of course Neuwirth is one of the most obvious choices, but perhaps too obvious, as much as I love her as a performer (I suggested her as Phyllis many times before Murphy was cast), she would play the role as it is typically played, what made Murphy's Phyllis so successful was the inner fragility that was always embedded with her dialogue/songs, if you notice her "Could I Leave You?" was not full of bitchy remarks but full of the pain of loving Benjamin Stone.
As everyone has said it's not gonna happen either way so moot point.
"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"