Did I miss this one in the list:
Fuzzy logic
Fuzzy logic isn't obsolete. It's a term specific to the field of AI, and may have lost some of its hype-value (along with AI itself for that matter), but if you're studying AI, you'll come across it sooner or later.
As a matter of fact, fuzzy logic was likely involved in a good number of controllers in stuff you use (car, washing machine, elevator, etc...) Some other controllers are based on neural networks.

AI not dead. It just became mainstream.