No more "the Mexican Marquez", no more "the run of the ball determining the nature of the pass", and no more "I just love the way a team passes around when they have the lead. Yeah, I think the confidence of the players has a lot to do with it as well."
I think instead of a straight up commentary system of in this situation play this clip, and in this one play that, and etc which is the way commentary has been done since the first day I think a more dynamic system should be implemented.
I think AI's should be constructed for both speakers who have knowledge and programming about how humans construct sentences. They should then produce their own sentences from scratch depending on the situation based on the reactions and output of the AI system. Then a voice recognition/duplication system would be implemented to copy and reproduce the voices of the speakers.
Just kidding

That would be way too complex, but I really think some innovations can be made. There should be some sort of in-game emotion meter for the speakers. And this meter would determine the level of enthisuasim for the speaker and the change from emotion to emotion. It would still be recordings, but a much deepet vault of recordings to match each emotional level and the transitions.
For example, we could have a speak who really enjoys dribbling. When Messi starts sprinting down the ball his excitement level would go up and his tone would change along with it, and when he enters to box to shoot he would be almost yelling.And if they score he would go bizzerk or if they miss he would be so dissappointed at the missed opportunity. But let's say the team is trying to build up play with short passes amd je doesn't enjoy that as much. He wouldn't be so excited at the goal or missed chances.
And his partner couldbe the opposite, he might not enjoy dribblers so much and be suprised how his aprtner can compliment Messi so much when he thinks he's playing so selfish and losing the ball so much.
Also, the speakers can talk about the direction of the game and what has happened so far based on simple things such as possesion and total shots and shots on target. He could talk about how a team has been dominating and the opposition really need to change their tactics, and how even though they have 10 shots they haven't been on target at all or that the goalie has saved so many goals. They can also do this for individuals. If let's say Adebayor has missed so many goals or Fabragas has been losing the ball so a lot, the speaker would start criticising the player as the game went on or as he continued to mess up. Or he could start to compliment the player after he has started to turn his performance around.