You could argue that all are capitalists, it's just that some of us only own significant capital in the form of our own bodies and minds. My point is just that the game is very different if the 'means of production' you control are something other than your own body and mind.

It is only possible for us all to be capitalists (in the sense that is meaningful to me - that your income comes from the return on capital) in a world where the work is done by robots, or by people do the work for fun or adventure... because, you see, someone needs to do the actual work that keeps things running.