Well, duh!

2theadvocate.com: News - Dome unlikely as shelter for 2006 12/09/05:

"The Louisiana Superdome, used three times as a refuge of last resort, should not and probably cannot be used as such a shelter for the 2006 hurricane season, the head of the commission in charge of the Superdome and a top official with the stadium's management firm both said Thursday."

Not a bad idea. A little late, but not bad.