The case was doomed before it was filed because the pretense and premise is a bit absurd. Air Travel is not a right on its own and the federal government is freely able to place limits on who is allowed onto an airplane already, for a lot of arbitrary reasons (Canadians or otherwise). Setting that aside, provinces also have a say in how that works and could easily also force isolation on returning travelers and invoke the notwithstanding clause to enforce it. Either way, by the time it is argued we will hopefully be past COVID restrictions.
It will also be interesting to see the moment of Peckford's lawyers arguing the intent of the constitution and the crown having to argue against it, given Peckford was there at its drafting. However, it would be foolish to believe the man to be automatically correct and infallible on this point in the court's eyes.
However, I do believe the discussion is worth having because if nothing else it will force the Canadian government to rethink its policies that were clearly developed on the fly without due consideration. Right now, with the benefit of hindsight, 14-day enforced quarantines and 3-5-day enforced stays at government designated hotels don't seem to have done much of anything other than throw the hospitality industry a bone. Personally, I would have preferred to see more aggressive testing done at points of entry, with quarantine notices essentially handed out to individuals who need it. Unfortunately successive governments undermined Canadian biotech industries and left the country without the needed capacity.
There need to be better policies and plans in place for the next time this happens and it is important to have the discussion of just how much you're able to dictate to a given individual.