I personally think it would be fair and expected that he would hand it over to someone to manage if the show ended. He's getting on and it's hard work, he could still keep an eye in, do some of the bits he enjoys but hand the main responsibility to someone else. Mind you, if it's not profitable, is it worth it if you're not doing and enjoying it yourself? Maybe he'd move it to YouTube as a vlogIf he doesn't it'll show that he's actually serious about farming but if he does, it means that he's not really interested and it's all done just for the show.