Sorry...
This is not at all true in regards to what is actually going on under Yellowstone. In fact, the hot spot has drifted under a stronger layer of crust and is deeper than it has been in the past. This greatly lessens the likely chances for a catastrophic Caldera type of eruption.
There may be smaller surface basalt flows like there have repeatedly been for millennium. They have occurred like clockwork through out the region. I have spent time there myself, touring these past flows. I also lived in the area for some time.
Sorry to rain on the knee jerker parade, but I'm sure you will soon find something else to feed your adrenaline addictions on.