AussieAndy.
100% agree that 'see and avoid' still prevails and as my original RAF inspired instructor instilled 'there is still no replacement for the mark 1 eyeball' - . . . . . but still collisions do occur (thankfully rarely). Maybe I am being pessimistic in my Murphy's law comment, but I do get worried at things which may instill a false sense of security.
Anyway, you are probably right - the chances of any of this happening is approximately 0%