Great analysis on the system's incentives, but it's worth noting that US seniors on Medicare don't actually get it completely 'free.' Most still pay monthly premiums for Part B (out of their Social Security), deductibles, and private supplemental insurance for drugs and copays. However, the heavy government subsidies definitely distort the market prices as you described.
Regarding the solution, it highlights a fundamental philosophical divide. Coming from an Italian/European perspective, our system is built on a different social contract: if a retiree gets sick and their pension isn't enough to afford treatment, we believe it's the state's moral duty to ensure they don't die or go broke, treating healthcare as a fundamental right.
The real challenge seems to be finding the balance. How do we prevent the 'Sickness Industrial Complex' from extracting endless wealth through bad incentives, without completely abandoning the most vulnerable citizens to the raw forces of the market?"