If Bernie Sanders gets the nomination, I still don't see a clear path to Bernie winning against Trump. A revolution like Bernie's will need some kind economic pain foisted onto the masses for them to want to even think about tearing it all down. I don't think the average voter understands or cares about the difference between communism, socialism, democratic socialism and social democracy. The average GOP voter will label all of it communism, and I don't know if the average swing voter will want to learn enough about poly sci to distinguish them.
A better marketing term would be "Social Democracy". It is capitalism with a strong social safety net and regulations to protect labor and the environment. Bernie's fundamental principles of wanting to provide Medicare For All, free college, expand existing social programs and make the rich pay their fair share of taxes are all fine proposals. Lyndon Johnson did it and no one thinks he was a marxist. He should know that most Americans would be described as social democrats, not democratic socialists. Democratic Socialism is a form of socialism, Social Democracy is capitalism for the middle classes. The terms only look alike.
Sanders has been clear that he wants the Nordic model and on the topic of billionaires he has been clear that: “Billionaires should not exist.” But Sweden and Norway both have more billionaires per capita than the United States — Sweden almost twice as many. Not only that, these billionaires are able to pass on their wealth to their children tax-free. Inheritance taxes in Sweden and Norway are zero, and in Denmark 15 percent. The United States, by contrast, has the fourth-highest estate taxes in the industrialized world at 40 percent.
The problem with Bernie is he's indulged by his ridged and fringe line of thinking where people think he's leading a war on capitalism. That's where it becomes an issue and people will tune out that message.