I would agree. You have hundreds of thousands of individuals in Canada as temporary foreign workers, irrespective of their NOC codes or skill or low skill. You also have, of course, hundreds of thousands of international students. They are, indeed, low-hanging fruit.
That would seem to be where we should put our attention; however, the system that is set up right now makes it very difficult even for a graduate of a three-year program in Canada—let's say, someone who is 22 or 23 years old. Even with one year of skilled work experience in Canada and with good English, that person will never hit the points required for selection under express entry.
For example, the last draw just a couple of days ago was in the 470s. That will take out the vast majority of international graduates with a two-year diploma.