Case 2 I suspect could be addressed by a law granting some level of immunity for simply having GMO plants in a field. But how do you fix Case 1 with laws? These are effects of biology and physics.
A lawsuit is rarely a good remedy to a problem, between legal costs, the time delay to any rewards, and the overloaded court system strongly encouraging people to settle out of court.
It's still ongoing and we're 24 years later.
The cases you are referencing are cases where the farmer discovers trace contamination of their field, then deliberately sprays Roundup to kill all non-GMO crops, then deliberately harvest seed from the survivors, then deliberately create a GMO section of their farm where they repeatedly plant and harvest to concentrate seed production until they have multiple thousands of acres of GMO crops they derived from the trace contamination [2].
Or cases where they signed a agreement to not replant their GMO soybeans, so they sold those GMO soybeans to a facility which sells to consumers for consumption, then turned around and rebought from that same facility the GMO soybeans they just sold so they could replant them [3] claiming that the sale to a third party meant they were not "replanting" the soybeans they just produced since they just oopsie-whoopsie bought them from someone not bound by the agreement.
If you actually look into it, most of the cases that people imagine were really bad or evidence of Monsanto screwing farmers are actually examples of ridiculously slimy farmers. That is not to say that Monsanto is a saint as they almost surely are hiding evidence of Roundup toxicity and you should be generally distrusting that large corporations are value-aligned with regular people, but specifically in the cases of Monsanto versus farmers, the farmers are almost always hiding how absolutely slimy they are actually being.
[1] https://www.npr.org/sections/thesalt/2013/06/12/190977225/co...
[2] https://en.wikipedia.org/wiki/Monsanto_Canada_Inc_v_Schmeise...
Is it horrific to be sued for modifying and selling software with a removed GPLv3 notice?
if the advancement is genuinely worthwhile, farmers are going to make it happen