Sometimes it helps me to think about a topic if the situation were reversed... in this case, if the NL already had the DH (or if baseball always had DH) and the consideration were to eliminate it.
I think in that case, it would be hard to argue to go to pitchers hitting. Just look at the stats difference in this article:
http://www.fangraphs.com/blogs/the-n...inally-get-it/
I welcome the inevitable addition of the DH to the NL.