Well, if its not going to be introduced explicitly, it will be done indirectly.
Just follow the political scene and you will understand. Why do you think an unlimited number of Ukranians (European, mostly Orthodox - Christian) could apply for urgent visitor visa and be eligible for an open work permit as soon as they land, leading to become certain Canadian PRs in the future ? To counter balance the immigrants from Asia - Africa. 100k+ approved so far and I believe they will reach up to 300k by the years end, equally to a whole year of federal immigration quotas.
Additionally, if the political party in power decides to increase the French language points to say 60, there will be a lot of future candidates whol will just give IELTS for the sake of getting CLB 7 and focus on French. No to mention if they decide to handle French draws, thats a different case completely which will balance the immigration stream even further.
You see, there are lots of ways that you can inderectly put a cap on country quotas.