I can't believe the 40-70% number. Looking it up, this underscores just how horribly the internet is set up to have these kinds of conversations. If you backsource it, you discover he said "there's a chance" it will hit 40-70%, and then only if no countermeasures are taken. That's very different than what is represented in the cbs transcript.
I saw another seemingly reputable estimate today - some disease person on Joe Rogan's podcast, who was saying that 96 million people could get it, of which 48 million would need to be hospitalized. This makes no sense unless you are predicting a virus mutation. We're not even close to seeing 50% hospitalization rates.