That's a great point. The short answer is I don't know. I just don't know, because we don't actually know yet about.... What we do know about these vaccines is that to date if someone gets the vaccine they're much less likely to have symptomatic COVID-19, significantly less likely to get symptomatic COVID-19.
Some people still get COVID-19 with the vaccines, but it's likely—I have to be careful with my words—that even if you do get COVID-19 with the vaccines, you're probably going to have a less severe course of illness. But you still can get infected and you can still transmit it to others.
I would imagine that the quarantine would be lifted when significant proportions of the Canadian population are vaccinated, such that if someone did introduce a case, it would not start tearing through communities like we're seeing it do now.
That's the best I can do for now. As we understand more about how this vaccine impacts transmission and infection, which we'll learn more about very closely over the coming months, I think I'll be able to have a much better answer for you.