There are potential upsides to this - fewer flu cases, for example, and money will be saved on travel, NBA tickets, concessions etc. I'm thinking that encouraging retail spending could offset some financial impact. I have to visit a couple of big-box stores today to enable working at home - could drop $1K at Best Buy on a Mac Book. With less-crowded stores and a visible canister of isopropyl wipes I think this will be fine. As long as there are delivery people and people (or robots) to pack boxes, online retail might be well positioned to minimize the physical handling of shipments. A friend with diabetes is now having his groceries boxes packed for him and won't have to enter the store.
With some guidance on best procedures retail spending doesn't have to call off a cliff. Might soothe some jitters, actually.
I think it's a good idea to display hand sanitizer if you have to go out and try to maximize distance from other shoppers.