At that point, you'll be lucky if you can shoot your vomit into an industrial sized trash can at point blank range, let alone sink a ping pong ball into a Solo cup from ten feet away. Not so with flip cup. You can keep things competitive no matter how badly your motor skills have deteriorated. At some point, though, you really do need to stop drinking before you do something you'll really regret.
Ah, what am I saying? You're an adult, you can make your own decisions.