Sorry, the silliness too tempting. But however you want to count the number of things that go into what Watson does, it really is a small portion of things humans can do.
What exponent is on the number of things that humans can do, generalized to the degree of "drive cars"?
OK, so it covers only a few human occupations:
But the list is steadily growing.
Now, connect it with a self-driving AI, and your cab e-driver can make small talk, advise on a suspicious skin lesion, evaluate your investment portfolio and help you fix an issue with your smartphone, all while cheaply and efficiently getting you to your destination.
How long until it can evaluate verbal or written customer requirements and write better routine software than your average programmer?