I thoroughly believe in change and working towards change but we were discussing medical care in the United States specifically. In this specific instance i.e. medical care in the United States I'm being realistic. I can't see the US medical care system changing to a socialist one in our life time. I believe the needs that have been discussed are immediate ones. So either one has to conform to the present situation and work on long-term changes, accepting that it will take that long, or if one needs good medical care more immediately, and I imagine especially when one retires, find a place to retire to that has good social services.
Regarding the other issues that need change that is up to the person as well along the above lines. If you can't see change happening and it really upsets you, yes, one can move to another country. It's a personal decision.
Sounds too much like ignoring the problem to me.
By the by, a socialist system would be provided by and for the local community. It annoys me to hear the old lie repeated that nationalisation equals socialism. It's just a Conservative myth to attribute the beaureaucratic inefficiency of that NATIONALIST system to socialism.