He has, actually. Declared all of it a big mistake. He's also declared it a CIA conspiracy several times. Watch the movie "A beautiful mind". Unfortunately, t

He has, actually. Declared all of it a big mistake. He's also declared it a CIA conspiracy several times. Watch the movie "A beautiful mind". Unfortunately, the theory was analysed by mathematicians and, under certain assumptions, was proven correct. In a system with many independent actors pursuing their own interest, anything that isn't a Nash-equilibrium cannot exist for a long time. Anything that isn't Pareto-efficient will be very, very bad for 99% of those independent actors.