Incidentally, "AI" (the original field called AI, not the latest definition of the term) definitely made it to 5. Except these days, we call some parts of it "SQL", other parts "the Web".
I once read an old book talking about AI including something called "expert systems" which are.... human-written if-then-else trees. The saying that we stop calling things "AI" when they become well-understood is real.
