I did see a special on yellowstone on PBS a while back and they said some interesting things. One was that the supervolcano will eventually blow, but there is no way geologically to guestimate the size since no supervolcano has erupted in recorded history. They also theorized that one went off in Omaha (I think Omaha anyhow) and that it may have killed off most of the giant animals that roamed north america after the dinosaurs. Things like huge cats larger than a lion, etc.
But it was all theory, and when scientists say something is due to happen soon they are usually talking in terms of earth time, which means it may go off anytime in the next 50,00 years or so.
Whatever happens, I'm happy to be faaaaaaar away from there.
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