They can't shut down the grocery stores for long periods of time for the simple fact that people will start starving to death, which has a mortality rate strictly worse than any pandemic disease. The only retail businesses still open in the worst-struck parts of China and Italy are the grocery stores and pharmacies, because they have to be open. They are essential. Some of my relatives are Italian and they have to book a specific time slot to go to the grocery store, and that and the pharmacy/doctor/hospital are the only things they can be on the roads to do.
These options will continue to be viable unless society completely collapses, which doesn't seem in the cards here.
These options will continue to be viable unless society completely collapses, which doesn't seem in the cards here.