Because the population in general has increased in average height we are likely to have more athletic 200cm+ players.That's going a bit too far back, the height of your average KPF has grown tremendously since even the mid-90s. It's still increasing now as Kappa has alluded to, but I'm a bit sceptical about players over 200cm actually being co-ordinated and athletic enough to really become a lasting trend.
I wonder if the AFL trains for agility in a similar way to basketball?