We would infect each other, and then it would be over with little disruption.
Unfortunately, our health care system cannot handle the 10% who would fall seriously ill.
A thought going forward (for the next one) -- is to have pre-staged MASH units and medical equipment that can be mobilized in 48 hours.
We could staff via a volunteer "National Guard" medical corps - where people could join and have twice a year training sessions.
Volunteers would be given big tax breaks or perhaps student debt forgiven in stages .. based on years of service.
Pre plan for this shit. Much cheaper. Far less disruptive. And .... another platform (like military service) to bring Americans together.