It should be a long while before a whole industry transfer. There isn’t a whole lot of advantage for things like lights to switch over. This will likely happen first in very expensive vehicles where dropping a few hundred for a bulb is just how people roll. It’s also going to be EV only since hybrid and ice cars will carry a 12v system.
That seems like an odd thing to state. There are lots of wired headphones and ear buds of all prices and styles. Are you only looking in store or also online?