It's not going to fall like some other songs did, that's for sure. I think it will spend a few weeks at number one, but I don't think it will have the longevity of her previous singles. Its sales are going to be more front-loaded.
I'm totally shocked that she did it with this song; the lyrics had bomb written all over them. And I'm surprised she did it at all given the heavy promo that BR needed - video, Gossip Girl - to hit #1 digitally.