Interesting idea but part of the beauty of baseball is how very much it is a team sport. Any day, any inning the so-called worst player on the roster could be the best player that day. Could be on offense or defense. Its how an Eric Sogard, the very definition of a replacement level player can transform a team by elevating his game. An idea like that, while tantalizing with its perceived excitement, isn't needed to make baseball exciting because it already is. The true romance of baseball is the unlikely hero. Kirk Gibson, Bucky Dent, Aaron Boone, Nyjer Morgan (lol) would anyone even talk about those guys if this rule were in place?