I don't know if this is meant to be pithy or serious, but I think I disagree. Agriculture is big business, farmers are smart people, and there is a history of lots of mechanization and interesting technology being applied. The productivity gains that we've already seen in the last hundred years (and before) are tremendous.

I'm sure that there are areas to be improved upon, but I expect a lot of the low hanging fruit has been picked, as it were.

I also tend to think of farmers as the original hackers, they often have problems, and they cobble together a solution that might not be pretty, but works.