Farmers have almost no leverage ... It's one of the lowest paid and most difficult job of the modern world. In practice, in relation to what they produce, they are already paid really close to zero so I'm not sure what's your point. You cannot seriously compare farmers with a global company like Monsanto.

And I'm talking about copyright/patent laws here, not wages, so it's even less related.

Economic (and other) incentives matter. They matter so much that even if some thing is "common good", you may have to pay for it.

Farmers produce food and have property rights to their products; they can then sell food (or donate). Companies produce new plant varieties, and they have intellectual property rights to their products which they can sell (and sometimes they donate as well).

If you cannot have IPR to new seed breeds, there is less economic and other incentive to create new ones, and you'll have less development of technology.

And the very reason that mankind has less hunger today than it has ever had (in proportion to population, and also in absolute terms in hundreds of years) is development of technology.

(By the way, farmers generally don't get wages; they get earnings, like companies do.)

Yes exactly, I agree with that. That's why there is inherently a conflict between what the market should provide as a goal (openly reusable seeds) and the incentives to create them (making them private is the only way to properly get money out of it).

That's why, because of this conflict, I'm not advocating for private company to product seeds, it's one of those markets (like health-care or public infrastructure) where the incentives will never be align whatever law you put in place. I would therefore advocate to move seeds to public research.

And I also agree with the technology part but none of what I can think of has similar problems to the seeds.