Just in case other people didn't know this, they're already instituting pitch clocks in the minors (just like they're saying they will do with this rule). That's probably going to end up happening in the next 3-5 years.
Because everyone one loves watching players who don't get to practice hitting have to strike out three times a game at the plate. The DH makes so much more sense.
Actually, the plus side comes from the extra strategy involved. Who do you want to pitch next inning? Who do you want to hit? Is there someone on base so we can sac bunt them?