I doubt there are that many people who are incapable of being more like Edison. Whether I am right or wrong doesn't change the truth of your prediction -- the contributions many are offering now will have a value of zero in the near future.
I would say those people really have only two choices: find another way to contribute or fail to contribute. We will need less physical labor. We will need more people solving problems. I believe more of us can and will step up to the challenge of developing new solutions and advancing America's productivity.
You can't ignore the problem and hope it goes away. It is a fact that half the population has below average IQ, and their labor is the most valuable thing they can offer. As that labor becomes obsolete, what do we do? Telling people to be more like Edison is not a realistic approach to this looming problem.