Not doubting it, but they've been saying that since the early 70's, when I was a kid sitting at Ranger fireside chats within the Park.
I've heard from 50 years to a few thousand years, from all at once, to decades of volcanic activity.
Depends on which expert.
That thermal hotspot is currently sliding underneath a fairly thick mountain range, the Absarokas.
http://en.wikipedia.org/wiki/Absaroka_Range
Beautiful mountain range too. Already has some dormant volcanoes within it.
It'll only add pressure as it continues under the Absarokas.
Then, "POP"!
If you look closely at the center of this pic, you see where it looks like someone has run their finger along and smudged out a bunch of mountains like a smile.
That is where the continent has run over the hotspot, and its removed all those mountain ranges over the past few million years.
Yellowstone is on the right end of the smile.
View attachment 55256
Someday the continent will slide far enough, that Billings Montana is projected to be within that thermal zone.
But not in anyone's lifetime who is reading this currently.
So if its not the Yellowstone Thermal Hotspot that gets you, still got Mt. Rainier in the Cascades, Asteroids, Comets, Mexican Drug Cartel, Terrorists, Cancer, Heart Attack, that stupid teenage kid down the street with his over-tuned riceburner...