Though I agree that the space given for a 'successful landing' should be increased, I don't particularly agree that it should be the whole airbase. I'd like to see the space increased about 2/3 meters from each side of the runway, that way, you don't have to land particularly ON the pavement for a successful, but within those extra few 6-9 feet.
In retrospect, I think 4-7 feet sounds better.