The umpires have enough to worry about, like trying to watch the game itself. They should stick to what they're (supposedly) good at, watching the play.
One (former Berri cricket player) umpire already spends too much time looking in the crowd.
I wouldn't have thought anyone would say they're doing such a fantastic job, lets give them more to worry about?
And how exactly are they going to determine which team they are supporting if they aren't wearing a club shirt? Perhaps I'd best go out and buy 5 shirts from the clubs I don't support.......