Marx foresaw and correctly predicted the rise of what he calls "organic composition of capital" (simplifying, machines and automated production) and the diminishing of human labour.. which can also be seen as accumulated past (dead) labour over living labour.

There is a famous fragment about how this, taken to the extreme, results in a contradiction that breaks the law of value, and it makes no more sense to use labour time as exchange value: https://www.marxists.org/archive/marx/works/1857/grundrisse/...

We are now seeing an almost literal realization of this passage:

  The accumulation of knowledge and of skill, of the general productive forces of the social brain, is thus absorbed into capital, as opposed to labour, and hence appears as an attribute of capital, and more specifically of fixed capital, in so far as it enters into the production process as a means of production proper