Every electrical system or circuit breaker removed from the control of the flight crew is an added fire risk.
Let's not be in such a rush to quick fixes for one in ten million risks that make more-likely risks worse.
@Dont Hang Up: I entirely agree. There are far too many people piling in here with apparently quick fixes, without looking at the wider situation and the probabilities of different occurrences. I'm not at all sure I'd want to fly on aircraft where the crew have no control over some systems, just on the off chance that they might have some homicidal intent. The legal profession has a saying, "hard cases make bad laws", which I think applies to a lot of these ideas.