There are many studies from reputable sources (one being the CBO) that say it would result in almost no savings or potentially even higher costs, just like there are many studies like this one that say there will be massive savings with no reduction in quality of care.

I support universal health care, but each side just lobs whatever data supports their position at the other without any real thought. Most people in support of a universal health care system seem to be completely unaware that the vast majority of households are happy with their current coverage (whether they should be or not isn't relevant really) and are not looking for someone who claims to know better to "improve their medical care" through a entity (the US federal government) that is generally not known for improving almost any situation it interacts with.

I personally would like to see Medicare opened up to the public as an option. It's simple, doesn't require anything of anyone who doesn't want to participate, and should be a reasonable test for the claims of cost savings. If it's truly a better option, people will move to it. If not, then the conversion will not happen.

Barring some sort of catastrophic financial or medical event, there is a 0% chance that anyone can make a radical change to the status quo.