I think lan parties are set for resurgence since we're almost at the point where a small handheld can run almost any game. What killed lan parties wasn't the internets. It's having to schlep a CRT to my friend's house.

But LAN parties were probably more common during the CRT era.

I wonder how much of an impact harder to crack games has had, as well as many titles removing LAN play as a form of DRM. PC LANs were basically driven by piracy.