Intangibles like customers, suppliers and know-how can be a lot more valuable than physical assets.
Maybe the restaurant building is still there, but if the visionary chef changed careers because she has to pay the rent, is it really still the same restaurant?
The tables, chairs and kitchen equipment are still there, but if former customers can no longer afford to dine there, is the restaurant still a viable business?
There is going to be some degree of disruption as organisational capacity needs to be restored but this is no different than any other natural disaster, from which economies usually rebounce very quickly.
And as to customers still being able to afford things, that's where the government can and will step in to stabilize demand.
As much as they can. Government debt at all levels across Europe and the Americas was out of control before the epidemic, especially in the U.S. This crisis will lead directly to waves of state/sovereign defaults.
I should say I'm optimistic about the pandemic itself. I firmly believe the morbidity and fatality rate will drop sharply as it spreads, even where medical systems are poorly prepared.
I think the economic effects will end up being the bigger concern.