I see your point and I agree that ultimately web design will be incredibly hard to automate, probably harder than almost any other programming domain, where people will likely stay for accountability reasons.

But the thing is that for the vast majority of web pages/applications, it barely matters what does the design look like, especially for B2B/internal apps. All the dashboards, CRMs, tracking tools, etc -- these exist mostly for functional requirements, so the design just needs to be inoffensive.

B2C market might hold longer, but ultimately there might emerge some sort of higher-level design specification language which would sidestep the original problem or being too recognizable.