Unfortunately, while a vaccine will hopefully provide very significant improvements in death rates among the most vulnerable demographics, there will still be significant numbers impacted even with 100% vaccination of those groups identified as most vulnerable. Vaccine effectiveness seems very high from the studies, but it's not 100%, and some may be unable to take the vaccine for various reasons (and some will refuse of course). Thus if we relax in the belief the main risk is averted, and cases explode in the unvaccinated population, it will become massively more likely that those vulnerable people left without protection (many of whom won't know they are unprotected) will come into contact with the virus. Furthermore, death rates have become the primary measure of direct Covid impact on health. but we know there are plenty people who don't die but are still severely impacted, some perhaps permanently. many of these are NOT within the identified "vulnerable" demographic. To the best of my knowledge we're all potentially vulnerable. Is that not so?
Of course, with a reduction in fatalities due to partial vaccination, there will be arguments that the mitigation justifies relaxation, and that's fair, but only to a certain extent. Vaccine may not be a silver bullet and especially not until a large proportion of the population is vaccinated. Vaccines are not just about protecting those who get it, it's also hoped they will dramatically reduce proliferation of the virus. however, there's not a huge amount of evidence yet that it can do this. It's possible that those who've been vaccinated will still be able to transfer the virus despite the vaccine preventing the carrier from becoming symptomatic. Hopefully this will not be the case but it remains to be seen, and the answer will hugely alter the impact of the vaccines.

It's tough to predict but I believe it will remain in place until the curve has flattened significantly in the US and/or most Canadians are vaccinated and felt to be safe.

So quarantines may be required until the fall, when they are saying most Canadians should be vaccinated. It may be sooner as more vaccines enter the stream.

Since it's uncertain whether the vaccine reduces disease transmission I don't think being vaccinated yourself will allow you to skip a quarantine.

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