Actually just those with Canadian education provide more than enough candidates to reach the economic immigration target. There are about 400,000 students entering Canada every year and around 100,000 ITAs issued each year. Even if they give all the ITAs to those with Canadian education, there will still be 300,000 students with canadian education left over from each year.If that's the case then the government is more likely to do CEC-only draws bi-weekly. But, at the end of the day, if Canada wants to hit their 2021 immigration target, they will need to continue with their FSW draws. This is especially true when you consider the recent US elections. Many immigrants, including Canadian citizens, will target the US now.
https://thepienews.com/news/canada-2019-new-study-permits-issued-increases-13-on-2018-figures/