I think it's a reasonable point. I know some farmers, and in every case I can think of the answer is "probably not".

However, most of the non-farmers I know wouldn't be able to, either. My brother has a lot of rooted devices — to stream movies, play video games — but he's not tech-savvy. Usually, there's some guy on eBay who will ship a hacked device to your house, or a co-worker who will do it for a few bucks.

Unlike an iPhone, you wouldn't ship a hacked tractor (any more than you'd download a tractor...) but markets form on their own, and I suspect that's what would happen here.