The author's point seems to be different in a minor, yet crucial point. You mention "won't", he focuses on "can't" and perhaps the lacking ability is due to a s

The author's point seems to be different in a minor, yet crucial point. You mention "won't", he focuses on "can't" and perhaps the lacking ability is due to a series of wonts. I agree that a lot of people won't, won't, won't, and I also agree that they eventually can't even when the ability matters.