Many hybrid seeds have to be produced year after year by hybrid seed farms. They yield great grain, but not seeds capable of reproduction.
People who trade around heirloom seeds do a great service in promoting genetic diversity. There just aren't enough of them.
If TSHTF and even one big hybrid seed producer goes out of business (Monsanto, for example), we are in a world of hurt.
TSHTF preppers, the heirloom seed traders, the Amish and maybe the Mormons survive. The rest of us better have something valuable to trade with them for food.
My family has owned/farmed land in this county since 1889. We are in the planting seed business. I am fully aware of what you wrote about. And the licensing mine field associated with it.
We have had to change sources for our seed because of it. Feel very comfortable with the people we are associated with.
The same can be said for the breeding of livestock, especially chickens. Breed for conversion rate from feed, nothing else.
In the wheat industry it is the same, you sell pounds. I the bushel weight is 60+ lbs./bu it is all about lbs. per acre. Nothing for quality. (except some contracts for specialty milling)
I am not a prepper, but what they advocate is largely how we have always lived. We are pretty self-sufficient and if necessary could be totally.