How does the United States plan to reallocate jobs for workers in a full automation economy?

So one of my professors said that that could happen within the next 20-30 years and that the U.S. has to use a lot of its gdp to reallocate job opportunities for those who will lose their jobs. How does that process even work? Also, will we have to do this or will it just be the private sector driving the creation of new employment opportunities?