Either the host country's end-of-life medical care is not great by American standards (in which case what you write is true, but many Americans wouldn't care to move), or it is, and a retiree would consume considerable public resources. Unfortunately, there's no way to have it both ways.
As a specific anecdote of the problem of government in healthcare: in my city a new children's hospital opened up a few years ago. The other area hospitals petitioned the government to not allow them to build the hospital until certain concessions were met. Among the concessions I'm aware of are not allowing the new hospital to own a medical chopper for 8 years. It was also not allowed to build a Level 1 trauma center. And of course that's after YEARS of not even being able to break ground while all this negotiating and concessions were being figured out. This type of interference raised the cost of healthcare for everyone in my city while likely decreasing the quality of care.
The other reason is that the government has an interest in maximizing economic growth, among other things, which is why it has zoning power. Citizens in the area, including local businesses such as other hospitals, may raise any number of concerns about building projects. Further, any citizen (or corporation) can hold up just about any project for as long as it's willing to keep paying legal fees to fight projects based on trumped up bullshit about esoteric zoning laws that were written a century ago that they probably broke when building their own hospital.
Outpatient treatment is increasingly more popular and more cost effective. Hospitals often raise costs by introducing massive capital costs that need to be amortized as well as other overheads.
With the exception of lower-cost, higher value primary care, there are rarely any meaningful access issues to doctors in metro areas. Those shortages are largely being addressed with PAs and NPs.
I'd be interested in a citation for this because it's counter to basic economic theory of supply and demand. If the supply outpaces demand, then the price should be going down, not up.
Here's an example. A quick good will find you many more. http://www.modernhealthcare.com/article/20150221/magazine/30...
Medical services are a complex market. It's nonsensical to randomly apply basic economic principles without knowing what you are doing. (Good luck telling congress that) The smart thing to do is to make primary care more accessible -- you'd be able to close many hospitals and improve outcomes.