you'll tell me the antibodies will wear off, and i'll tell you that's not how it works. most weak viruses move to the "stored as memory" phase. it's really sort of mysterious how your body seems to know what the bad ones are, but it does.
and, if your body will forget the acquired antibodies, it will forget the vaccine, too, anyways. a vaccine won't be more effective than natural antibodies. so, that would suggest you'd need to be vaccinated every few months to maintain protection - and that may end up being true for some categories of people. but, what it means is that healthy, young people should just fight it off.
so, if the government could prioritize allowing antibody testing through ohip....
it would tell me if i've already had it or not, anyways. and, that's far more useful to me than anything else you could do for me - it's unlikely that i'll get vaccinated regardless, but i'm hardly going to volunteer to get vaccinated until i've had an antibody test, first.