Have any noted "free market, deregulation" advocates changed their tune?

I read alot of free market economists and none of them deny the possibilty of bad outcomes from free markets, they would just deny that the outcomes from government interventions would be any better. Regulatory capture is the most likely outcome of increased regulations because of the incentives involved. Warren Buffets gives an example:

It is the regulators job to take away the punch bowl just as the party is starting to get good. However the regulators owe their jobs to the good graces of the party guests.