There's absolutely no contradiction here.
Currently less than 20% of Americans work in factories. All those 80% need to want is that the 20% of people who want to work in factories can do so.
Currently less than 20% of Americans work in factories. All those 80% need to want is that the 20% of people who want to work in factories can do so.
From TFA:
> When I first went to China as a naive 24 year old, I told my supplier I was going to “work a day in his factory!” I lasted 4 hours.