This is a non-issue; the stock will temporarily lose a bit of value through the increase of supply and that's it. Amazon as a company would still intrinsically be valued at hundreds of billions if not 1+ trillion, even if Bezos were to die tomorrow and his will would say that all of his shares should be sold on the market within a day. The fact that you might only end up redistributing $70 billion instead of the $80 billion he was worth when alive doesn't matter, it's still $70 billion being redistributed.