Your disagreement with the author is semantical.
Look around. About half the people in this country are bringing our civilization to the brink of failure. If that doesn't change, our civilization will fail.
An arithmetic argument that some indeterminate number of humans in a population engaging in some amorphous/undefined behavior that doesn't take into account reaction from another part of the population is determinative of civilizational collapse is interesting. I'd like to see you model that. Should be as easy as climate change modeling.