Right now there is a thicker layer of the Earth's crust covering the hot spot in Yellowstone than there was the last time it blew. It will be a LONG time before the Earth's crust shifts enough for a thinner region of it to be over Yellowstone again. Somewhere around 8-9 years ago there was a tv catastrophie movie made about it. The movie sucked but after it there was a hour long show about the science of the hot spot in Yellowstone which was very good.