You're absolutely right about the need for training and retraining. As a lawyer representing union health plans, I'm one of those "who derive all, or a considerable portion, of their income from insurance sales and administration within the insurance industry." Single-payer would put many of my clients out of business. But that was actually the original intent. The original collective bargaining agreements establishing these health funds had a provision that, if universal health care was enacted, the parties would go back to the negotiating table to bargain over what to do with the contributions formerly made to health insurance.

The answer may come from some of my other clients - union training and retraining programs. While the ones I represent are mostly in the construction industry, we need to expand training programs to other industries, and offer them without charge to those displaced. This goes, not only for those displaced by the transition to single-payer, but the necessary transitions we need to make to deal with climate change.