First, I think that what you are describing is not specific to the trades. The availability of labour is an across-the-board issue in society. It is also a matter of demographics. In fact, we see that the birth rate is just not sufficient. That is one of the reasons why there is a somewhat more aggressive immigration policy, one that aims to make us more competitive with other nations, so that we can attract and retain employees from all walks of life and from everywhere.
Moreover, what you have to say is entirely true. We need a proper human resources plan. That is why this government put in place a lot of measures to promote the trades. I am repeating myself to some extent. There are subsidies for apprentices and employers. There are also initiatives to raise awareness.
Rather than making very costly investments in a single area, I prefer to see a series of measures that act in the right places and promote the trades.