It’s still only good for 20 years, same as a plant patent or even a utility patent. IP protection for plant breeders has been good for mankind.
I seriously doubt that the lobbyists could ever get the clout to expand that length like Disney did with copyrights. That happened because entertainment is unessential to life, even then, when Disney lobbied for further extension, they got the cold shoulder because Congress correctly gauged public animosity towards any further extensions.
I think the voting public would pretty much go ballistic on extension of plant protection because everybody eats.
Congress can also wipe out those protections just as easily as they created them. The foodies and envirals are always wailing about patented seeds now, their heads would explode if Congress seriously took up considering extending them.
What do you do for a living?
Are you in Canada?