As a farmer, as much as the techie in me would love nothing more, I struggle to see it. There is a pretty large chasm between hobbyist-level tools and industrial-level tools, and it is a stretch to, quite literally, bet the farm on the former. Proven tools with timely service and support are essential to getting the work done in time.

Robotics is already big in agriculture and has been for decades. As someone once said "technology is developed by military, adopted by agriculture, and then the rest of the world is finally exposed to it." If you can dream of a way to robotize agriculture, it is quite likely already commercially available. Any farmers who do happen to come up with a novel idea to improve agriculture will be undoubtedly looking at commercialization to raise the necessary capital to develop such a machine.

There is unquestionably a long history of farmers bringing innovations to the industry, and undoubtedly will continue to be, but they are not exactly projects that you slap together in your free time from open source materials. Those who have something to build put forth serious investment, and often requiring outside investment, to make them a reality.

That said, I could definitely see popularity among gardeners, where the scale is tiny and the practice is already a hobby.