3 points
My guess is that some non-insignificant (though certainly not large) new portion of buyers will replace their head units, assuming they keep the double DIN standard. It’s trivial to change out currently.
Of course if too many people do it they’ll change the slot and make the wiring harness an incomprehensible mess. One wire now controls your left rear audio channel, rolls down all your windows, and deploys caltrops if the police are behind you. If you wire things incorrectly it locks you in and sets the car on fire.
