"The Mo-MJ thing in the 200 was largely expected to be caused by cramping due to creatine and brought on by dehydration. Multiple heats had been run in hot conditions (one reason NOT to hold the Oly Trials in Sacramento)"
It seems to me that conditions were largely the same in Athens. Also, consider LA, Atlanta, Barcelona, Rome, Seoul, Mexico City, and Beijing, all of which are hot and/or humid during their respective summer Olympic Games. I think Sac is the perfect place to hold trials that might simulate weather conditions in Olympic host countries.