True, but those unsolved, more urgent problems often require more educated labor. Many taxi drivers who find themselves out of a job likely don't have the skill

True, but those unsolved, more urgent problems often require more educated labor. Many taxi drivers who find themselves out of a job likely don't have the skills necessary to quickly reintegrate into the labor market solving the tougher problems you're talking about. As machines continue to replace humans in tasks that can be automated, fewer unskilled jobs will be left for less-educated segments of the labor force. As technology automates new processes that previously required human labor, the educational barrier to entry becomes higher for the jobs that are left, because the easier productivity problems have been solved.