Oz, of course it can happen- there is nothing in life without risk.
But what is the chance of it happening ?
Now that is the question.
If it is less than the chance of both engines failing at once on a 767 I personally would want to allocate my safety resources elsewhere. Wouldn't you?
I remember being involved in reducing that rediculous airspace size - up to 21nm radius at ground level and 200nm at twenty or so thousand feet. All with one controller! A huge waste of money! We were the laughing stock of the world - and everything was separated from everything else as if all pilots were blind and incompetent.
No wonder you are in Europe!