I guess it depends on what they are wanting to do with the show. Given the fact that the original was deliberately chosen to have a short run, perhaps they have decided to do the same with the new series. That's certainly what it sounds like from the article's description. In which case, there probably won't be a second season for him to leave.
Bless you my American chum for this faith in British TV. However, it's being made by Sky One (operated by Rupert Murdoch) and Sky One's record on producing quality product of their own is not exactly high.