Smaller operators like this have a problem with their pilots leaving once they gain experience. That's the nature of the beast. The catch 22 for these operators is that experienced pilots, the ideal candidates, won't apply and inexperienced pilots need more training and will move on as soon as they can. On top of that pilots want to fly, not do all the other dogsbody work.
I'd say you'd be lucky to keep a pilot for three years in those situations. That in my opinion is why they came up with this cadet scheme. They'll get at least three years out of him or her (although it will probably be a him) and when he's not flying he will be used to carrying out other duties.
For the right person it will be a good gig.