Seems like they'd HAVE to go in that direction if they want to realign the leagues and basically have interleague every night (with 2 divisions of 15, they'd have to).
And when a manager is forced to decide between pulling the pitcher or letting him bat so he can stay out there, isn't that basically acknowledging that he sucks as a batter, and they'd rather take their chances in the bullpen? It's exciting when the pitcher gets a hit because it's rare, and you're used to them sucking donkey balls out there. Not really interested in 1/9th of the game being about a blind squirrel trying to find a nut...
With only a few exceptions, the 'pure DH' is falling out of the league, as well. For most teams at this point, it's become a position they rotate people through rather than a dedicated guy. Ortiz is becoming the exception, and even he isn't TERRIBLE at 1B, there's just better options, so not worth sitting Youk or Gonzalez to do so.
Can't see the MLBPA wanting to let the DH go, as it's a way to let the aging players compete for a couple more years on the end of their careers, and it also allows teams to sign players to longer, more expensive contracts, knowing that they can at least put them at DH towards the end. Doubt A-Rod will be playing much 3B in his early 40s, but the Yankees are going to pay him 30 million a year anyway, so he'll be the DH. Without that position available, he'd have a shorter contract for sure.
Plus, I'd just rather see a legit attempt at an at-bat rather than a weak swing and miss, sac bunt attempt in the 2nd inning, or a pitcher choosing to pitch around the 8th guy in the order to get to the pitcher. With how specialized the roles have become, I just want to see decent at-bats. It's funny when Cliff Lee gets a hit, but less so when he gets pulled in the 6th because he's up next. And less so again when you have to pull your starting LF because a reliever is up to bat soon and you want to double-switch.