A Saturday night Marx question

Now you know what I'm working on this evening.  Here it is in brief:  Marx thought technological innovation under capitalism would produce a falling rate of profit for capitalist enterprises, but he thought this because he accepted the labor theory of value, which is false.  Yet at the limit technological innovation under capitalism will produce a falling rate of profit because the elimination of human labor will reduce the total pool of consumers.  Is there a good discussion of this in the economic literature?  Thanks.