I think the barrier to entry to be "good" is fairly high, it just isn't artificial, like most barriers. There is no certification, money, or time barrier artificially constraining supply.
You need persistence, logical (not magical) thinking, willingness to learn a tremendous amount of material, and the ability to envision abstraction in order to become a programmer. These skills co-occur in only a limited portion of the population and of that, only a subset would be willing to live the programmer lifestyle (indoor, bad for extroverts, sedentary, not so high-status as being a Dr.)
You need persistence, logical (not magical) thinking, willingness to learn a tremendous amount of material, and the ability to envision abstraction in order to become a programmer. These skills co-occur in only a limited portion of the population and of that, only a subset would be willing to live the programmer lifestyle (indoor, bad for extroverts, sedentary, not so high-status as being a Dr.)