If you test for average pilots, then you've still got approx 50% of pilots who aren't capable.
Whatever happened to testing for the lowest common denominator - especially in life and death situations?
In fact, this is a similar technique some actors use to make sure they know their lines cold -- no matter how well they can recite them with full concentration, can they still recite them while playing an intense video game? Because things will be so different on stage/set, it will be equivalently distracting.