This. And it'll be addressed naturally once plumbers retire. The existence of fewer plumbers means that their prices will go up, which will attract more people

This. And it'll be addressed naturally once plumbers retire. The existence of fewer plumbers means that their prices will go up, which will attract more people into the trade. The fact that there is a "shortage" of plumbers means that the pay isn't high enough for ambitious people to drop what they're doing and get into plumbing.