Like Glenn Close, Streisand is waaaaay too old. If SUNSET BLVD. the musical is ever filmed it will need Cate Blanchette and Jack Gyllenhaal to get green lit.
But I don't think it's EVER getting made. Why? Because both Jesus Christ Superstar and Cats were flops. Phantom only broke even due to foreign. Evita was his only financial film success, and that didn't do Mama Mia or Chicago style business. Basically his musicals have not worked at the cinema box office. So why do another one and throw good money after bad?