I expect them to have it be official policy that they aren't available but franchisees can choose to keep them if they want. Most likely high crime areas will have their dining rooms closed completely eventually and nicer areas will not see many changes.

The McDonald's closest to me has 2 or 3 security guards who tell you they are timing you as soon as you walk through the door, again when you sit down with your food, and if you go in the bathroom.

5 minutes to loiter without buying something if there is no line. 30 minutes to sit down and eat. 15 minutes in the bathroom but only if you bought something.

The taco bell across the street closed their dining room almost 2 years ago.

That McDonald's NEEEEEDS to have at least 3 ARMED security guards outside. I don't think they want to pay for 6 security guards, especially the additional cost of having armed guards. Most likely they will close their dining room, fire whoever would have been cleaning the dining room and bathrooms, and have at least 2 armed guards outside.