Brilliant! But their decline is probably due to the inundation of porno and their over-priced underwhelming food.
I think Hooters is doing fine. Still 300 locations in the U.S. That said...
COOK YOUR WINGS LONGER!
I've not seen the South Park episode, but here's another take:
Double Whammies is a Hooters style roadside sports bar in Texas whose manager is very protective of her girls and wants the place to be a respectable restaurant like Chili's or Applebee's, albeit with less clothes. Regina Hall is excellent and the supporting cast has depth. This would have made a fine pilot for a potentially long-running tv show; think All in the Family, Cheers, the Mary Tyler Moore Show, Frasier, the Bob Newhart Show, Seinfeld, pick your favorite.
These are shows in which nothing much happens in most episodes, the humor is always present but usually muted, and the characters quietly grow on you if you stick with it. The ensemble cast keeps the spotlight moving around, and after a couple of seasons, enough backstory has been developed that the regular characters will emerge as three dimensional people. That's hard to do in a one-off movie, which is why slice of life films often feel like they're dangling.
Support the Girls is built around the iron triangle that keeps the joint running despite the boss from hell (the owner, not the manager), plus some strong supporting characters -- Officer Delgado, Bobo, the Professor, and a couple of others -- who would have made terrific series regulars. The movie all happens in one day when the place finally blows up and a lot of people get fired; a series would have had to change that.