Here's what the Bernie Bros and MFA folks won't admit - you can't have a government run single payer system that is single minded obsessed on "reducing costs" while still having the same privatized health care delivery industry that you had before. It is simply not possible.
MFA would, absolutely, choke private providers to the point over time that they'd simply quit and close up shop. There is no way MFA as a single payer can exist otherwise.
Hospitals are already closing all over the country and we don't have MFA.