no goals change games, oliver bierhoff said germany were playing with fear after that. If that had been allowed England would have played their normal game and wouldn't have been open to the counter attack
If England have been performing better than they did not only from the start of that match but from the start of the tournament, it would have been a better result for them as performance and consistency boost confidence and perhaps it could probably have translated into a victory over the Germans. If Rooney was performing like he did in Man United, England could have scored more goals and thus win the group in effect avoids Germany.