Personally, if I were you, I'd worry a lot more about whether or not we have enough of a future on this planet to be replaced by machines.
I don't think even Marx was able to foresee the damage to the environment caused by end stage capitalism. And I'm not sure the philosophers and economists you cite are quite his equals. Any tech billionaire can predict flying cars, but can he predict exactly the way world politics and economies will unfold a century and a half from now?
Marx did. And it would be best if we took note of where we are headed and the consequences of runaway capitalism.
Not disagreeing with you, it's not mutually exclusive.
Chances are pretty good we will still be kicking around on the big blue marble in about five years when these smart and agile contraptions actually start replacing a lot of labor, and a good many bolted down lesser cousins are already doing just that today.