I'm starting to learn human history is people getting bored of something and then it takes a generation or two before it's exciting all over again.

Fashion, I suppose.

There's definitely novelty, fashion, and fads. There's no particular reason why rollerblading essentially went away in the US after being a pretty popular activity for a time. In consumer tech, auction sites didn't go away but they certainly declined.

Sometimes, there are reasons--far fewer people shoot pics with dedicated cameras today for obvious reasons. But sometimes, things that were a novelty just get boring for most.