Seriously, those business would probably be better off just closing, so they wouldn’t have to pay expenses while having little to no income, but they are all locked in to commercial leases that are going to be multi-year contracts. That expense will keep piling up no matter what they do, so there’s no easy escape hatch for most of them.
The best they can do is lay off most of the staff and operate with a skeleton crew, limited menu and just try to make whatever small income they can to try and stop the bleeding.
I went to Denny’s in the summer and they had a limited menu which looked like they printed it up in the back. Went back recently and they are back to a full menu. They have put up plastic barriers between the booths so they can seat more folks and resumed 24 hour operations. The Chinese buffet across the street is doing good business.