You hope but it won't happen. Their bunkers are super hidden with multiple entrances and will mostly have automated defense. Who ever is able to turn on them from the inside won't have access to the food storage and important stuff, they will basically be hostages.
I read an article about them flying out experts and paying them ridiculous amounts of money just to plan for these eventuality. I can't imagine how many millions they dump into failsafes. They need to die before things get bad enough, once they are in the bunker and the outside world is broken, they win.
Only hope is a foreign power like China coming in and mopping up with bunker busters.