It costs a lot of money for restaurant to simply "open" and "close." These businesses are already taking a huge hit from being virtually closed the entire year.
"Opening" and "Closing" each time is very expensive, and not simple. For example, restaurants need to hire and coordinate staffing, make sure food is properly stocked, and then re-promote when they're open again, etc.
I don't see how many of these fine dining establishments can survive like this, and with social distancing of only 25% capacity.
Not-to-mention a large segment of their clientele has likely been under employed for a long period of time as well.
And this is largely a global issue affecting the entire world. God help us all.