Changing housing situations is exactly as easy as changing hospitals and emergency rooms no? Since the latter are mostly decided by where you live. In fact, most mid to large cities feature many hospitals near any given residence, so it is actually easier. I would also point out that the demand curve for housing, energy and food are far more inelastic than for medicine.
> If you have cancer though than basicall the market cannot find a price, and it would tend towards to: 'give me all you have'.
Why couldn't the market find a price? Cancer actually seems like the worse example possible. The people I've known who've been diagnosed with cancer have shopped around for care from many different hospitals. It would seem that cancer would be the perfect candidate for market forces to lower prices since a diagnosis generally affords a bit of time to find and decide on treatment options. Even in the extreme case of 'you have months to live' people tend to spend a few weeks collecting different opinions.