I'm not sure that the rules don't still allow the backup camera to display on the rearview mirror. (Don't see anything definitive on this.) In any case, most consumers really want an in-dash nav display (and other infotainment) at this point.
But the backup camera requirement may have nudged things along a bit.
> But the backup camera requirement may have nudged things along a bit.
It _definitely_ had a major effect on the low end vehicles. It raised the floor more than it changed the ceiling.
In my last vehicle, I definitely chose one that had more buttons/dials than some of my other choices and it was a surprisingly high priority.