Don't TV networks have a 7 second delay so they can edit out all the whoops words? Also, the point of having an umpire mic'd up so that we can hear what the umpire is saying, is it then ok to use that on-field mic to effectively spy on the players?
Mic up a few truckies at work if you want to hear some choice words, how about leaving the footballers in their workplace out of it?