I found a stat that suggested ~100 [1] (another stat says 500 and 15,000 injuries (!) [2] and there's a 3rd between them [3]), so say 600 million. Given the insurance cost of replacing vehicles, that would only be 30k accidents prevented to pay for itself.
FWIW, I've heard anecdotally that the insurance companies pushed for backup cameras more than anyone else, but given the benefits to lower insurance (arguable, but in theory), less deaths and less injuries, it seems like a win. The technology will also get cheaper over the years.
