I think it's important in policy discussions to distinguish "simple" and "easy" as concepts. Needless to say, it would not be easy to end and unravel the drug war. As a concept and goal, however, it is a simple decision.
> What will all of those local police departments do without the 'easy' money from the government?
Perhaps they could attempt to solve and prevent crimes involving violence and fraudulent behavior, which theoretically is the reason they exist in the first place.
And the idea that the war on drugs is a revenue-positive endeavor is so preposterous I am not sure how to even address it.