not sure if this is correct
https://ecomodder.com/wiki/Mirror_Laws_by_State_(U.S.)
it won't happen because the law specifically states must be a mirror. written back in ye olden days.
till that gets changed, you won't be seeing any cars with just camera's .
Easy to get that changed. Not an issue. Laws also didn't require rear bumpers for pickup trucks, or energy absorbing bumpers for minivans.
Don't believe Indiana has allowed vehicles without rear bumpers, at least since the early 70's.
No state can require less than the Feds mandate, but they can require more in some cases, such as the one you outline. I know that base model pickups were sold without bumpers well into the 80s in Ohio, and maybe longer than that.
