Insurance works when you cover the costs. They would need to quadruple Medicare premiums and payroll tax to have the average person remotely come close to paying for their Medicare. The only reason it stayed afloat as long as it did without deficits was the no income cap - someone with a 30m/yr salary was contributing was contributing $870k/yr with employer match.
So you want to do away with the insurance altogether and have them become wards of the state when they exhaust their resources. You do realize that indigent care has been a civil responsibility since the 1500’s. Research the poor laws sometime.
Judges in the 13 colonies spent much of their time forcing cities and towns to care for their share of the indigents.
Don’t get me wrong. I’m not against reform that reduces costs while providing care. But I’m not for shirking responsibility either and just cutting people off from care.