What's the average human's mental calculation capacities compared to our ancestors when the electronic calculator didn't exist ? Who can calculate integrals by hand nowadays ?
AI is the ultimate tool. Who needs to get a phd when your computer can do the work / solve the task better than you would do and in a fraction of the time you'd require.
Sure there's still gonna be a need for specialists but on average most humans are losing their capacities because their tools get better.