If umpires don't grant time for hitters when they step out of the box after EVERY pitch, the game will zip along. Aside from the extra time used for all of the mid-inning "matchup" relievers (this won't change) and the time it takes for the commercial breaks (much longer now and that won't change either), if the umpires will call strikes as defined in the rule book it will force more swings and the game will move along.
Watch a Greg Maddux or Tommy John pitched game on Youtube and you'll see how it can be done.
Watch a Greg Maddux or Tommy John pitched game on Youtube and you'll see how it can be done.