I hope they don't do this. It's a terrible (great?) way to keep the fleet fragmented. It really hurts those of us that keep our cars more than 3 years. How long will they develop separate software for MCU1 before giving up and writing it off. I say about 3 to 6 months from today.
They don't seem to care much about that. HW3 In firmware still looks like AP2 Camera and radar. You can argue for the less than 50k AP2 cars they sold with FSD it's cheaper to just make them disappear to unify the fleet around AP2.5 sensors.