It would have totally changed WvW experience. Like in world of warcraft, you can't infinitely stack at one spot. There are collisions and players will start pushing out each other. I think this wouldve been a better platform for wvw. We can always dodge when we are crowded. And it will nautrally discourage stacking. Sure, it will make it much more difficult to control the big zerg as a commander. But that just means more coordinated team play.