I call that a success.
This decline may have nothing to do with the WOD, as alcohol use declined during the same period. ("the per capita consumption of alcohol has continued to decline since 1980 among the populace as a whole, and among underage drinkers [...] Since 1980 per capita consumption among college students has slowly decreased mirroring a decrease among adults." - http://www.indiana.edu/~engs/articles/kb.html)
For its own reasons that had nothing to do with the WOD.
"The creation of grass roots associations such as Mothers Against Drunk Driving, severe penalties against drunk driving, public outcry against fetal alcohol syndrome, decreases in legal blood alcohol concentration limit for impaired driving, 21 year old alcohol purchase laws, abstinence education in schools and colleges, tavern owners being liable for alcohol related incidence, and warning labels on alcoholic beverages are all part of the current movement."