In order to have Medicare for all you would need to add a 12%
additional tax on people's earnings to fund it, and that will not fly with the 'working' voters, who would be forced to fund such an idea. Currently 2.9% is withdrawn from people's paycheck's to fund the 60 million seniors on Medicare now, which will be insolvent in 7 years to boot

There are over 300 million people in the USA now, 30 million or more that are here illegally, most likely. Do the math and you would need an additional
FOUR TIMES THE CURRENT TAX FUNDING RATE OF 2.9% to have Medicare for all for the additional 240 million people, with the private insurance companies all closing. There are NO free lunches in life. Somebody has to pay for it, and we are already $21 trillion in debt. The Office Of Management and Budget already said this notion of universal Medicare would add another $32 trillion to the already ridiculous amount of debt now.