A couple things.
1) I would LOVE to see another deck for numerous reasons. The obvious huge capacity would be incredible, the noise would be downright terrifying, etc. The problem is, I don't know where another 20,000 people would park, how they would get that approved by a fire marshal, yada yada. I don't know the rules, but it seems like it could be a logistical nightmare.
2) I think it would be great to get some bigger/better scoreboards. I'd like to see a monstrous HD videoboard in each endzone. I want to see each and every drop of spittle forced from the Buckeye QB when he gets pounded into the ground. I want to see the look of fear in a Spartan defender's eyes when he realizes there's a ninja quarterback coming right at him.