Another way is to require certification for more kinds of activities in the first place.
If Americans want access to less expensive healthcare, why not make it so that some kinds of medical treatment are available from people with ~2 years of education instead of 10? (Yes, the treatment would be inferior, but also much less expensive.)
Also, when IBM's Watson becomes the world's best diagnostician (Any Day Now), what will its legal status be? Probably IBM would be happy with a special exception to the law that makes it hard for other computer companies to enter the market?