Probably just a matter of time. Wind continues to bring in carry fungal spores and microbes, and once the radiation dies down to low levels, the natural rotting process will resume.
I apologize in advance for the punny (and not so funny to some of you, I'm sure) title. It is, as you can probably tell, a hat tip to the One Weird Trick ad you see floating around the web, as explained by Slate. No hate mails please!
Right before Adolf was conceived, a giant yellow duck suddenly appeared in Ma & Pa Hitler's home, causing them to immediately stop having sex and thus World War II was averted.
My favorite part of the post :)