Sure, but perhaps the rationing that would occur under socialized medicine would be more rational (not going to keep dying people alive for an extra month at a cost of $1 million) and less harmful than the rationing that occurs today (tens of millions uninsured or under-insured). I don't hear the British or the Canadians crying out about how they desperately want to adopt the American system, at least not middle class Canadians and British.
Therein lies the problem. Our politicians have zero desire to control spending. Do you really think any of them are going to cut end of life care? Grandma and Grandpa vote to often for that to happen in any meaningful way. Do you really think they actually care about what a plan might cost in 15 years when they are out of office?
What you suggest requires common sense out of our politicians and I am not optimistic that we will see that for quite some time.