USA always brought home medals at every WTF International Event until this year. For decades USA was the number two country in the world in terms of medal production, right behind Korea. I think it is a combination of a lot of factors all coming together at the same time -- stagnant us developmental program, other countries getting better, Lopez family losing steam for a variety of reasons, enforcement of steven lopez anti leg checking rule (developed specifically to neutralize him), La Just at world championships, general anti-american sentiment worldwide and not just in taekwondo, lack of political or other power of US representatives to WTF, poor behavior repeatedly exhibited by USAT representatives at WTF events, general dislike of David Askinas within WTF, etc. You cannot have all these things going on at the same time and not expect negative ramifications.