Do umpires have 'whistle fatigue'?

With constant rule changes and pressure from clubs and fans, how difficult is it to be an AFL umpire? Paul Roos says the push in the backs are at 'epidemic levels' as well as a crack down on the 15m kick, insufficient intent and protected area rules has lead the umpires to potential 'whistle fatigue'. Also, the Lions have a new den in Brisbane, Roos reminisces about his time at the GABBA.