Who gets earpieces? Who gets mics? All 9 players on the field, all coaches, the manager, the stats consultant? Who controls the security of communication, and how? Players cover their mouths when talking because cameras zeroing in on conversations are subject to lip-reading. Bullpen phones are hard wired rather than cellular for the security reasons. I know your suggestion was well-meaning and possibly partly tongue-in-cheek, but I don't think it's anywhere close to viable.