Nationalized healthcare doesn’t stop at a pharmaceutical manufacturer’s borders. You think NHS or any other country with socialized medicine pays what the US does? With socialized healthcare the pharmaceutical companies pay what the nation dictates or it doesn’t do business with that nation. I highly doubt Novo Nordisk would write off the US if it went to Medicare for all.
Not really sure what that has to do with anything. It would be easy for the USA to keep Novo Nordisk from doing business within its borders and have a nationalized pharmaceutical company produce the drugs at cost.