The worst that can happen is that the system shuts down. We don't get out. Shipments stop coming in and it's a race to see if we starve or freeze to death first. My money is on the freezing.
Alternatively the worst might be that some people freeze to death. Some start eating each other. The system comes back online and takes away all powers, knocks down our IQs, maybe strips away our ability to see and walk while it's at it and we just sit around having robots feed us through tubes while we drool on ourselves.