The trade schools are just fine, TYVM. However, salaries have not been rising that much in the trades which indicates that there is not some magic "undersupply

The trade schools are just fine, TYVM. However, salaries have not been rising that much in the trades which indicates that there is not some magic "undersupply" in them. When there is a genuine shortage, salaries go up. If salaries aren't going up, there isn't a shortage.