They say the same thing about Tacoma, with Mt. Rainer also being over due for an eruption. Rainer is poised to have huges mud slides that will flatten everything for hundreds of miles around it.
The real question is, will either mountains eruption be something on the scale of Mt. Mazama? When it blew, it covered almost all of Oregon, some of Northers California, Idaho and Washington with it's lava flows and ash fall. There are still, thousands of years later, huge lava and obsidian fields where nothing will grow. Mt. Mazama is now better knows as Crater Lake.
My prediction? With in my life time, one of those two will erupt.