I wouldn't worry too much about trucking, trains, air traffic, water, power, hospitals and food delivery. As long as the powers-that-be temporarily nationalize and take control of the basics soon enough they can be maintained by skeleton emergency crews for extended periods of time. It was done quite well and efficiently during WW2.

That isn't to say it would be smooth. Elective medical treatments would be gone for the duration. Services and resources probably rationed. Rolling blackouts and shortages possible.

A rough ride for people who are used to having everything. But, for the most part, everyone would make it. Nobody gets fat but nobody starves. It isn't the capitalist way but tough. It is how we got through WW2. It is a proven strategy for hard times.