Edit: I should not try to incorporate basic math in dumb jokes about Mules called Osama when I first wake up in the morning, apparently. I am old enough to know better, I have no idea what happened there.
In all seriousness, there were at least a dozen other notable armed conflicts happening around 2010, so I think 30 years was simply a little too short of a timespan for world peace (although the average person's risk of dying violently did drop quite significantly during that time). He was likely thinking more about larger events-- particularly of course the use of nuclear weapons, which he strongly campaigned against. So far, so good there, but it's still way too early to draw conclusions.
A lot of solid foresight in general, though. The main thing that stands out to me is just how it's all taking a lot longer to play out than people were thinking it would in the early 80s.