I often hear people argue against this by saying more goods than ever will be produced, how can the working class see a loss in wealth?

I think people fail to account for the immense lack of jobs this will cause, as well as the relative power gain the wealthy will experience by controlling even more of the manufacturing process than they already do. Any downward pressure on the price of goods would be totally offset for the working classes by the immense downward pressure also caused on wages, and the inflationary pressure that would happen on a good like housing or food- not because they are more scarce, but because the people in control of them can afford to take relatively more of your income