I don't think Lloyd Webber or any musical director, or show director would see Sarah Jessica Parker playing this role simply because her singing voice is not comparable to the people that have played this role before. Evita is obviously a major singing role unlike characters like Princess Winifred in which an astonishing voice is not required, I insist that Parker is ideal for Sweet Charity or Chicago, roles that do not need a big belter, she'd have been great as Ruth Sherwood in my opinion. Anyways, I love Sarah Jessica Parker but she's just not Evita.
"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"