EUGENE, Ore. — It has been all the talk for nearly a decade now, that middle- and long-distance running in the United States has been resurrected from the depths of the 1990s (when Bob Kennedy did pretty much all the work himself, and work that cannot be discounted for influencing what has occurred since) to a point where American men and women are genuine medal threats (albeit nothing resembling medal certainties) in nearly every event from 800 meters to 10,000 meters.