The article's conclusion states a concern I've had for decades. Only when we reach full employment will we know:
If people have left the workforce because of the downturn in the economy, or if they’ve left forever because the economy fundamentally changed. If that’s the case, the U.S. officially will become a place where the labor market has little use for millions of Americans.The low-level jobs we've exported to China and India previously employed low-ability Americans. The jobs are gone but the low-ability Americans are still here.