This kind of political game has been played for generations in other areas besides insurance.
Municipal transit used to be privately owned and run, but politicians would not allow the fares to be raised to a level that would cover costs. The net result was that private companies were driven out of business and local governments took over, saddling the taxpayers with the costs that fares don't cover.
That is what "single payer" means in any context -- a government monopoly that virtually guarantees worse service. Why would anyone want that for something as crucial as medical care?
One reason, of course, is the ever seductive illusion of something for nothing, an illusion spread by glib politicians, posing as saviors of the public against villains in the private sector.
Yet another way in which ObamaCare is an old political story is that it began as supposedly a way to deal with the problem of a segment of the population -- those without health insurance.
But, instead of directly helping those particular people to get insurance, the "solution" was to expand the government's power over everybody, including people who already had health insurance that they wanted to keep.
Since there has never been a society of human beings without at least some segment with some problem, this is a formula for a never-ending expansion of government power. Barack Obama, Nancy Pelosi and Harry Reid are all on record as believing in a "single payer" system -- that is, a government monopoly able to impose its own will on everybody. Even the current and future problems of ObamaCare can help them to reach that goal.