The shutdown is not a plan; it is a hasty but necessary retreat. Its purpose must be to shrink cases, and ramp up our infrastructure, enough to switch to more targeted suppression measures.
We already have a gold standard for fighting epidemics: early identification of symptomatic patients, contact tracing, isolation of those infected and exposed, and widespread random sampling of the population to detect new outbreaks among unidentified contacts. Only by identifying and isolating the sick can the healthy get back to work.
The crucial lesson is that we need not endure mass closure for the duration of the pandemic. We are only stuck doing it now because we were caught with our pants down, failing to implement the normal methods early enough.
This is not a hypothetical point: South Korea managed to control its outbreak without ever resorting to mass closures. It did so through a combination of massive testing, rigorous contact tracing, and isolation of the infected. Not only were people with symptoms tested and quarantined, but authorities went through considerable effort to track down people who may have been in contact with the sick and test them as well.