Sure, but single-payer government healthcare has an enormous ability to influence the cost in the first place. Outside of a treatment that demonstrably has a true cost to manufacture (when also accounting for R&D) that is within that ballpark of say, $1MM per dose, I suspect you’d find the government finding ways to bring the cost closer to reality.

Also, rarely is it the case that such expensive treatments are needed by more than a fraction of the population. I’d say there’s an argument to be made that we all aught to be okay with a small fraction of people getting healthcare that far outstrips their contribution via taxes – given that we never know if that one day may be us.