Without ratings, CBS will cancel the show. The way I see it, casting Rob & Amber will bring a bunch of Survivor fans to the show & they will realize how it is really the BEST reality show & they'll tell their friends & the ratings will increase. AR's ratings have increased, but they are not "Survivor" ratings, so the show is not guaranteed to return every season. From what I've read, it has been very close to being cancelled more than once. Maybe if they start getting better ratings, we'll get a reunion special after the finale, like Survivor. That would be awesome.