In the two weeks before the start of government-mandated closures, I noticed I was getting to work faster and when I would go out to lunch the dining rooms were rather sparse. Definitely not business as usual. One mass outbreak linked to popular venue, like Walt Disney World, definitely would have caused a reaction.
I provided some data earlier in the thread. About 16% of the population is aged 65 or older. Then you start adding in all of the other risk factors like heart issues, pulmonary issues, immune system issues, cancer, etc. and you could easily be looking at 25% of the population who are known to be high risk. It's just family who would have to be isolated. A very healthy pulmonologist with a whole family that is low-risk would still have to be part of this isolation because of direct contact with those who are high risk, and not just the doctor but the doctor's entire staff and their dependents. It doesn't seem un reasonable to think that for every high risk person there is at least one unique individual who is either a dependent or care giver. Our high risk only isolation has now ballooned to half the population and this still ignores that those who are low risk are still getting more than just a cough and fever for a few days. An office of healthy young adults is going to be less productive if a nice chunk of them are all out sick for two week increments.