I see Matt and Trey incorporating this into a South Park episode very soon.
I suspect they'll lay low for a while. If the bigwigs at Sony are worried, a couple of scriptwriters aren't gonna stake their lives on a few throwaway lines. Ultimately, Team America was written and produced during an era in which a North Korean terror attack would have been a gift-wrapped invitation for Bush to move South Korea's northern border to the Yalu River, and Kim Jong-il knew it. Kim Jong-un probably believes Obama's reaction to the assassinations of key Hollywood players that falls short of a mass casualty attack would be noncommittal. And Kim's likely to be right.