Besty, I think people's complaints come from the fact that Arthur Laurents seems to have made a big deal about casting young actors (in their teens or early 20s, I believe) in this production, and that is one of the factors that would make this revival "ground-breaking" and whatnot. Well, casting Cavenaugh contradicts that idea in a way.
Plus, didn't Laurents say he wanted to truly get the gritty aspect of the show?
"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"