The host of spinoff interview programme The Apprentice: You're Fired told Metro that show boss Lord Alan Sugar will call time on the competition at some point.
"I don't think Sir Alan Sugar wants to do it forever, so we've probably got a couple more years," O Briain said.
"People always say they don't like the idiots on the show, so the last series had people who had run their own businesses and were quite competent, then people complained there weren't enough idiots.
"It's a fine balancing act. People like the ones who say, 'I'm like a giant shark', but they also like the ones who can actually do the job."
Asked if he felt bad for the 'cannon fodder' put on the show, he added: "They're put into awkward situations that might heighten the tension and scope for mistakes but they don't find the crazy people who might go on The X Factor for viewers to point and laugh at.
"The most common response from the audience on our show is, 'Oh, they're not that bad, really', which is fine by me. They look extreme on The Apprentice and then a bit remorseful on our show."
Young Apprentice is currently in its third series on BBC One. Series ten of the adult show returns in 2013, having been commissioned for two more runs.