As for the optimisation to _waste human life_ I do agree but the reality is that the sites which waste the majority of human life/time are the ones which would not be automated by the MCP and would, ultimately, see more 'real' usage by virtue of the fact that your average human will have more time to mindlessly scroll their favourite echo-chamber.
Then we have the whole other debate of whether we really believe that the VC funders whom are largely responsible for the current state of the web will continue pumping money into something which would hurt their bottom line from another angle?