Speaking after Sky1's autumn press launch, the Hotel Babylon star claimed that it was a "dreadful" decision by the BBC to cancel the show.
He explained: "It's a very difficult thing, this thing that's happening now in the business, that is showbiz. It seems to be about ratings, and sustaining a market.
"Certainly Survivors, when we put that series out, the second series dipped below 5 million for one of the episodes - all of a sudden, there's no recommission, and I think that's dreadful."
He added: "I think that if you've got 5 million people that enjoy drama and invest in characters, you must take the time to not worry about your job and getting sacked and just go for it and hit it again.
"But it just goes to show how much of a business it's becoming now, so consequently what happens is there are easy targets for reality shows."