I have just got round to reading this and there is something wrong with Ian Wright’s argument as he ends up by saying that, at some point in future, machines that produce surplus value could exist.
I think that’s what wrong is that he thinks that “value” is a thing that exists in any society, not just capitalism. He is a sort of “market socialist” in that he envisages a post-capitalist economy made up of workers cooperatives producing for sale. He knows us and our position but doesn’t think that it would work. But he always has something stimulating to say.
As to the answer to his analysis, I think it will be along the lines of that capitalists pay for the machines but that the work they do is a natural force (like that of animals) that costs them nothing and so doesn’t produce value or surplus value.