You have clearly identified the problem, and this raises the full issue of apprentices and companions. At the time when I represented young professional workers, I saw quite a few young college graduates specialized in technical subjects who could not find work in the industry because they were harassed by the Commission de la construction du Québec.
Currently, we have a problem that mainly has to do with entrepreneurs. I understand that older workers may feel threatened, but this is no reason to stop young workers from moving to different regions. These are skilled workers trained by the Quebec education system which is envied all over the world. Some of them would be ready to make the sacrifice and move.
Let us keep in mind that this is a seasonal industry. Choosing to work in construction is somewhat like choosing to become a soldier. Such jobs entail a certain amount of mobility. But it still remains that these people need permits in order to move. There is no reason why we cannot do this while still respecting older workers. As you said so rightly, the older workers are getting older. If we do not rely on younger workers to prepare for the next generation, we are shooting ourselves in the foot. Our industry is under provincial jurisdiction, but let us not forget that the same applies to the other provinces.