"Eventually they probably will split and up and maybe want to have their own careers. The choice is theirs, and we've got the opportunity to do both. But from what I hear, they're really enjoying what they're doing and we don't feel there's anything seriously wrong here. They're getting more time off and I hope they stay a band for a long time." Music mogul Simon Cowell has warned One Direction's young fans the boyband are unlikely to be together forever.