The mall food court isn't just a place to grab a quick bite to eat while you do some shopping or catch a movie with your bestie. It's now the place where restaurant franchise are born. Well, they aren't exactly born there, but they're certainly tested there.
If you think about it, it's the perfect place to test out a concept. There's (usually) plenty of foot traffic and most malls won't let two similar businesses in the food court. So you wouldn't see two big burger brands battle it out side by side. It would be one or the other...or neither if your burger brand is lucky enough to edge out the big names.