As long as Yellowstone continues to vent it is not that big a worry. It is when it doesn't vent that we should worry. That said, what is the evidence for repeated super-volcanos. I'm not saying, but only speculating that they could be one time events...where the explosion destroys the process leading to the vent in the first place.
Actually the more ventng the more to worry about. The venting we see at yellowstone is not the volcano venting, it is groundwater being heated by the magma chamber. the more venting the closer the magma chamber is to the ground water and the earth surface. If the magma chamber gets winin a few miles of the surface ...... BOOM!
"...what is the evidence for repeated super-volcnaos"? - blanknoone
The underlying "Yellowstone" structure began with a comet strike that punctured the upper and lower crust of the earth, causing lava flows that formed the Columbia River Plateau - in Washington State! Later, as the upper crust moved towards the Pacific, the punctured lower crust again allowed massive flows, forming the Snake River Plain - in Idaho. Now, Yellowstone, in Wyoming, has moved over that same weakened lower crust; it's blown in a big way there three times, so far. Repetition enough?