>I'm not a fan of the Rosie casting<
No such casting announcement has been made by the production itself. I wouldn't believe a word from Rosie's PR team until the Annie producers announce casting.
>I give Annie 6 months.<
Annie lasted six years in its original production. The 20th Anniversary production was a tattered, threadbare, dispiriting affair with an ill-cast Nell Carter and a production that was like a badly faded mimeograph version of the great original. New York really hasn't gotten a lavish, full-scale Annie since the original closed in 1983 - almost 30 years. If the tepid West Side Story revival can last two years at the Palace, and if Priscilla, which never seemed to quite catch fire at the box office, can still last a year, Annie - unless something goes horribly wrong with it - should fare just fine at the Palace.
Begin at the beginning and go on till you come to the end: then stop.