@no1marauder saidHe'll only step down if failing health forces him to. And if that does happen, he'll still probably go out kicking and screaming.
Do you think he'll serve out his entire term? He'll be 80 before the midterms.
More to the point, he doesn't really want to do anything (he has no real ideology), he just wants adulation. Plus he's not going to jail now no matter what and he's been personally vindicated at least electorally.
Even if his health holds up (always iffy at that age and he doesn't exactly keep himself in shape), do you think it's possible he steps down at some point?