Looks like it's not "running out" so much as "not producing them fast enough to meet demand, and also we're running out of people who know how to find & safely harvest them."
It's funny because I had an idea that growing trees and selling extra saplings might be a decent way for me to make some income if/when I leave the city. I was instinctively pretty certain that capitalism would have made that impossible to be a viable way to earn anything reasonable but now I am curious about it again.
Pash wrote
I must've fundamentally misunderstood seeds.....