You'd have to do that for every round and I reckon you'd get a lot more easy match ups. The way it's currently set up the top eight seeds are set to meet in the quarters. The beauty of sport is that it doesn't always go that way. Leave it as it is I say.
I'm not sure how that would improve things? The way it's set up now the winners of the group play the runners up off a different group. It's up to the individual teams to actually win their groups. Our side of the draw should have had the two previous world cup winners in it. Turns out Spain...