Yep. Gut it. The dome is too iconic to replace but it needs to be scrapped from the inside out. Leave the outside like it is except add retractable roof.
Gut the entire inside. In addition to seats put restaurants and food areas that serve REAL food. Yea you can put a place to get nachos and chili dogs down in the basement but there needs to be real food. It's too important to our culture. Add more bathrooms along with additional single stall toilets. Big screens everywhere so you can sit down and take a crap and not miss a minute of the game (they exist I did this myself at Bank Of America Stadium once.

Hate to say it, but the Superdome will never host another Super Bowl, after the Great Beyonce Blackout. There has never been a more embarassing black eye to happen to a city/stadium in all the history of pro sports, period, end of story. Sorry, another Super Bowl is just not going to happen until/unless they get a new stadium built. I was laughing pretty hard at the time, but there will always be a question in the public's minds, as to whether the blackout influenced the momentum of the game.

Have to disagree with you on this. Most embarrassing thing to happen is when your stadium is named after an energy company (Reliant Energy) and the power goes out. This happened in Houston a few years ago.