Apple doesn't have to wire up anything, or even do anything, they just need to leave the API open and the ecosystem will take care of it.
Touch controllers simply won't work for gaming like that...
It's not that simple. If you're a developer you have to target a few dozen possible controllers with different button combinations for a still small market. It doesn't make any sense and it's entirely non Apple.
If you do touch screens, you can even play the game on the go without the AppleTV. It's the direction that makes the most sense, and it's already where Apple is going.
You may be right that touch controllers "simply won't work for gaming like that," but it's still what Apple is most likely to do. They're not interested in going directly against traditional consoles like the 360, and even companies like Nintendo are moving towards touch screen as controller.