A national health care plan, freed from the health insurance lobbyists, will reduce administrative overhead by 800 billion dollars.  It will also cut prescription drug spending in half, by repealing Medicare Part D.  

This enormous savings will allow for a relatively small 30 billion dollars to help and retrain the many insurance company employees who will lose their jobs.  See http://www.pnhp.org/facts/single-payer-faq#insurance_companies 

HR676 Medicare For All needs our support.  112 Reps co signed, but, in the senate, last year, not one senator joined Bernie Sanders when he introduced Medicare For All.  Hrrono says "single payer is too hard."  Schatz says, nothing on the topic of Medicare For All, that I have heard.

Simply put, health care doesn't need a bunch of competing health insurance companies, each creating their own little Byzantium of waste, in order for health care to work.  Physicians world wide manage to provide vastly superior health care results without it.  CDC.