In many ways, I feel like Croatia was cheated of a chance to beat Brazil. Would if not have been more beneficial to introduce replay capabilities to review the legitimacy of penalties. I think it would make sense to add it. It would eliminate any bias or uncertainty from the official. It also would not make much of a difference to have the review. The official can simply add stoppage time to compensate for it. It seems only like a logical progression. Every other major sport utilizes replay technology, which is more than accessible.
It also helps in other situations as well. After watching Mexico play Cameroon and seeing on two separate occasions a goal wrongly disallowed for Mexico. Mexico eventually won the game 1-0 but what if they hadn't. If somehow Cameroon had scored in the game and forced a draw, Mexico loses out on two points in the world's biggest competition. They would have been robbed of a win they should have had. If the wrongly disallowed goals were reviewable and overturned then it wouldn't be an issue.
I only see this benefitting soccer. It adds even more integrity to the game as now teams cannot win on a technicality or a mistake from an official. It makes the game much more fair. Not to mention no longer has to make embarrassing apologies for poor officiating. I don't see a downside to this either. They could use the same technology that ESPN has on every play involving offsides, which clearly shows the correct call. FIFA has already embraced this integration of technology with the new goal line technology. It only seems like the next logical step.
Those are my thoughts on it. Let me know what you think.