Artificial turf is horrible.  It smoothes out the hop of ground balls, so much so that Ozzie Smith figured out that on a long throw from the hole, the ball would reach first base a few milliseconds sooner if he intentionally threw a one-hopper instead of a strike.  That's really cool, but it's not baseball - it's more like a video game.  Artificial turf is also hard on players' knees and feet, and shortens their careers.

Get rid of artificial turf.  Baseball should be played on a grass field on a perfect summer day.

The designated hitter ruins the game.  Get rid of it.  The strategy of a baseball game is one of its most exciting aspects.  Should the manager let his pitcher hit in the bottom of the sixth when behind by two runs?  Should he pinch hit for him?  Should he double-switch?  Fans of American League teams don't have those questions to ponder during a game, and that's a shame.  Engaging in what Tim McCarver calls "first-guessing" (as opposed to "second-guessing") adds a lot to the enjoyment of watching a game.

As far as the DH goes, why not go even further?  Why not field 18 players for every game?  When your team is in the field, you could send out your pitcher and eight speedy, slick-fielding, rocket-armed defensive geniuses.  When your team is at bat you could send up your nine slow-footed, steroid-shooting, muscle-bound sluggers.  The result wouldn't really be baseball, but it would have more scoring, and that's what the Commissioner's Office seems to want.