Switching has to have an end result. It used to because you could get an entry into the 50m arc rather than a kick down the line to contest. It simply doesn't happen against good teams any more.
Kicking across the ground to a contest on the opposite wing, which we saw in Sydney, is pointless. The result is the same as kicking down the line. It may move the zone on the MCG, but they don't have to run as far on the SCG.
The trend for the better teams is to switch left, then back again to move the zone. And then do it again....The two or three kicks needed to get it to the opposite side, as per the traditional switch, is simply too slow for the way the winning teams play. We did it to Sydney, they did it to us.
When watching the game, don't look at the ball when a team tries to switch. Look at the HBF for the opposition, and you will see if the switch is going anywhere long before the ball gets there, as the opposition will have it covered or not.