I debated this with myself a few times, but have always shrugged off the potential of using instant replay because I feel it isn't necessary. Baseball has come this far without it, it can continue with out it. As for the increase in bad calls, it's just part of the game. Sometimes the calls go your way and sometimes they don't. Nature of the beast my friend. But if they were to start using instant replay, it should only be used in the playoffs (*cough, cough, A.J. Perzinski, cough*).