If I had to pick one.... The Canadian Apprenticeship Forum did a study a few years ago, and found that perhaps 82% of employers who were eligible to hire an apprentice chose not to. For a myriad of reasons, they're not participating in apprenticeship programs.
So if I had a wish, it would be how to engage those employers. I would think, though, if we engage those employers, the supply is there. Young people are there. They want to participate. They just can't get their foot in the door to get started.