It'll take some serious self-discipline from every fan who enters that stadium to help make it work. I say this because I've seen the condition of a public bathroom once the public has had its way with it -- especially in our beloved hometown for the Who Dat Nation ;)
I've been to few games, been to two in New Orleans. I've never had to go to the restroom, maybe it's because I don't drink but I also go before I go to a game.
I'll have no problem going to any game, mask or no mask.