I saw the Discovery Channel show about this as well. The cycle is not exactly 600K years. It has gone off from 600,000 - 700,000 years intervals for the past 3 eruptions that we know of.
Granted, it's going to blow up but I wouldn't be canceling any planned trips there for the next 10,000 years.
if the thing can hold off even a thousand years the technology will be in place to minimize the damage. or they'll just haul everyone off world for awhile as nasa will have put up the space elevator