Seriously... I would have Batista "injure" him and he could go away for a few months. Start hyping Batista as guy who could ruin your career. Let HHH come back, have a little blood feud with Batista, with Batista going over in some gimmick match. HHH would then work near the top of the card for a few years with an occasional title shot. By the time he'd get back to the belt, there would be a whole new batch of people for him to have feuds with.
Never happen, but that would be the best thing to do with Triple H.