Hot spots are by nature in constant flux. Kauai isn’t nearly far enough from the main plume to say for absolute certainty that a flare in the mantle couldn’t cause the dormant volcano there to reactivate. At the very least there are seismic events to consider. There was a 6.0 quake about a week ago just outside of Kona. That is plenty to potentially cause a landslide of cave-in on Kauai. These could also cause tsunamis which could cause all sorts of issues for a bunker.