I'm not advocating anything but I'll respond in the interests of reasonable debate.
To extrapolate cost in this fashion requires that medicare users are a reasonable cross-section of society rather than people over 65 and low-income people whose use of healthcare is known to be disproportionately high.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
