Second, there is unlikely to be any physical danger to anyone
Software / computer security is increasingly capable of causing physical dangers to people. If you notice, computers are parts of machines which operate physically around humans.
Likelihood : Not sure what methodology you are using to compute likelihood. A huge majority of processors of the dominant architecture (X86) from the dominant company (Intel) have a relatively easy to exploit attack, over last 2 decades, some of which need to be patched but will never be due to apathy, which in turn is partly due to statements like yours. So your unquantified assertion of low likelihood is increasing the likelihood by a small amount.