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.
https://www.cnn.com/world/wired-headphones-comeback-spc
https://mashable.com/article/wired-headphones-instagram-acco...
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.