Commentary: Impact of new rules?

Like a lot of sports followers worldwide, I've been enjoying soccer's World Cup over the last month. The artistry, the high drama, the back-and-forth play, it's all been great. But there's one thing that's notable about soccer -- it never changes. Tactics might change, and a few tweaks might be thrown in here or there (like the yellow/red card system instead of verbal warnings), but change comes slowly.