As for the average person picking well, I encourage you to look at the Motley Fool community. There you'll find literally millions of hobbyist investors, some who have been chatting together since the mid 90s and many, many people doing well. Even looking at the medium-active CAPS player (basically their over/under prediction board where anyone can make bull or bear cases on any stock), it's better than what you'd get giving your money to Wealthfront or some other manager.
Blocking retail investors from micro caps would just be one more way insulating the rich from competition with the conscientious. As bad as Sarbox has been, that would be an entirely new way to make the US system less equitable for the masses.
