This same guy noted that the real concern wasn't residential plumbing. This work is fairly low-skilled. The issue is that large commercial buildings require much skill and experience. Perhaps a solution would be to stratify the definition of "plumber" to allow those with a lower-level license to do easy work. Those with the upper-level licenses could do the more complicated stuff.
I think you are exactly right about the need for two tiers in the trades. The wiring in a house is vastly different from even the local supermarket that has three phase power to the lights controlled by contactors.
Maybe by adding a category of "professional" plumbers and electricians you could solve the prestige problem. Currently, if someone says they are a plumber you don't know if they clean out drains or maintain a hospital's systems.
This is one of those classic economics/free market sayings that shows who wrong the theory can be. That's like saying I would be happy if I was the only guitarist or only web developer in the world, which is patently untrue. Maybe the plumber enjoys what he does, finds value in it, and wants to teach others how to do it. Maybe, god forbid, he doesn't want to make as much money as possible at the expense of others. Crazy, right? I'm glad there are other musicians and web developers, not only is the world better for it, I am better at both for it. Looking at things your way leaves so much out of the equation and ultimately leads to a conclusion that is bizarre, detached from reality, and incorrect.
I actually think yo would be pretty happy. You would automatically be a rock star. Sure, some needs would be unfulfilled, but overall the benefit of being the only one is incredible.
Similarly, if the number of plumbers drops too low, people will concentrate on buying cheap/disposable/replaceable substitutes for what they fix.
The difference being, when a plumber screws up, the house floods. When an electrician screws up it burns down, possibly with you and your children inside.
I'll take my overqualified electricians, thanks.
It already has been. The really skilled people are called pipefitters and hate being called plumbers. Most industrial work is done by pipefitters, and plumbers do residential/commercial work.
The codes are quite different (more complex, more exacting) for one thing, in the industrial setting.