The problem is that Maturi tried to get the benefits of the new stadium on the cheap. When the Twins opened Target Field and sold out nearly all of the first season they still blasted the airwaves with commercials about how beautiful it was to have outdoor baseball and offer fans the chance to put a deposit down to get season tickets and be in on the fun in future years. The University didn't spend a dime on advertising the new stadium because they felt that with a sold out first season, they maximized their revenue so why bother. Well in year 2 and 3 when they started having some single game tickets they thought "Well, we only have 1,000 seats so it's not worth it to advertise, so let's just email the existing customers" and the result is empty seats.
So...
1. Advertise - The Vikings have had commercials on for the past 3-4 months despite only having a few thousand tickets available each game. I must admit that their commercials have been well done (IMHO). They show images of past Vikings greats and how much this state lives/dies with the team. They also acknowledge the heart breaking defeats. The Gophers can do the same. Show some images of Memorial Stadium, some iconic glory figures, acknowledge what everyone knows in that the teams have broken hearts, and then showcase the stadium and how we want people to be part of a new beginning in TCF Bank Stadium. It can work.
2. Guarantee your price - It's probably a safe bet that the athletic department won't increase their price based on the difficulty of filling the stadium, so why not offer existing and new customers a chance to lock in their price/donations for the next 3 years if they purchase by a certain time? Everyone knows it's going to take a few years to build this thing back up so acknowledge it and market it to your advantage.
3. Get the alcohol issue resolved. I don't care what you do just get it done. If it's really costing over a million in revenue a year then Kaler should be pounding on doors at the capital to drum up support. Do something and build the demand back up for the premium seats.
4. Continue working on the students. 5500 is just way too small. Continue to make it a party atmosphere for the students and work on getting the number up. For those that do come, have some sort of giveaway promotion where when students show up by kickoff they get 1/2 of the promotional item and as they leave after the game is done they get the other 1/2...give them incentive to stay for 4 quarters is the gist of it.