FACT: The only league WITHOUT the DH rule in the USA is the National League. Little League, High School, College and the lower minor leagues all use the DH rule exclusively.
Gee, I wonder why pitchers' batting averages have gone down every decade?
Might it be that, because of all the DH's, pitchers don't take much batting practice?
Looks like a vicious cycle to me...
Pitchers' BA has been going down every decade since 1900. The DH has only been around since the seventies.
You could take the DH away tomorrow...and pitchers' BA would continue to decline.
Why? Because a pitcher spending extra effort into refining his craft will bear greater dividends than investing extra effort into batting practice.
If you were a boxer, would you waste anytime learning how to wrestle?