How would they stay rich? I'm not defending rich people, but I don't begrudge them for the fact that they worked hard for many years to become rich.
Honestly, do you think someone with the knowledge and ability to make hundreds of millions of dollars is just going to sit around and let themselves be taxed to death? If you were rich, and bernie were elected, you'd leave America. Why? because you could afford to leave. Common middle class people can't, they will end up paying the bill.
And as for free education; How much do you think doctors and lawyers will payed if they're a dime a dozen?