If we can build robots with human level intelligence then you could apply that to all of the costs you describe with substantial savings. Even if such a robot was $100k that is still a one time cost (with maintenance but that’s a fraction of the full price) and long-term substantially cheaper than human workers.

So it’s not just the products that get cheaper, it’s the materials that go into the products that get cheaper too. Heck, what if the robots can build other robots? The cost of that would get cheaper too.