After watching more matches, it seams that the referees have becoming a bigger x-factor. I've seen some pretty incredible calls, and some even bigger non-calls. I expect officiating to play a part in football matches, but in this World Cup it's a bigger part than normal.
I'm not asking for video replay, but maybe could do one thing similar to the NHL. The NHL has added a second referee in addition to the two linesman. I don't expect a single referee to see the entire pitch the entire match, but an additional set of eyes couldn't hurt.
Let the players decide the outcome of the match not the officials.