Most people don't like wire and don't care about genuinely good sound through wire vs. artificially sweetened (DSP-ed) sound through Bluetooth. That's what Apple is targeting at, the mass consumer.

Wired headphones are making a comeback though. They're even considered trendy/fashionable now.

https://www.cnn.com/world/wired-headphones-comeback-spc

https://mashable.com/article/wired-headphones-instagram-acco...

Honestly that "most people" seems to be more marketing driven than real opinion.

When you simply can't purchase one thing, then you move to the next thing.

I have several wired and wireless headphones, all for different uses, and the existence of wireless headphones don't make the wired ones less useful for their particular strenghts.