This whole business of mid-air risk is massively overdone.
Apart from close to airfields (e.g. the Stapleford/Wellesbourne sunny Sunday free for all
) it is as close to zero as one can get. In an aircraft with infinite endurance, etc, you could fly on random trajectories, above the MSA obviously, blindfold, and it is 99% sure you would die of old age before hitting something. This includes doing it in controlled airspace, too.....
Contrary to the old school, a lookout doesn't do much because a target on a
genuine collission course will be a stationary point in the sky and probably won't be spotted. In the context of straight line flight, "lookout" is an illusion. Probably works well with gliders and other traffic that goes around and around.
An FIS ("seven aircraft known in the area") is worthless for this purpose.
As gasax says, better to work on not smashing the plane on landing, or into the side of a hill
I do think Mode C should be mandatory everywhere, for all powered aircraft. Then, an RIS would be a lot more useful.