We investigated this and looked at options for rollbacks, but unfortunately the long term disruption from rolling the world back at this point was too great. The world will come back online without a rollback after the maintenance is completed.
We continue to work hard on stopping these kind of events before they happen and finding a solution has an incredibly high priority for us. The behavior of these world-time events is complex, and not necessarily the same across worlds. We are investigating and alarming those events as we learn more.