To get to herd immunity of 70%, we'd need to infect 600,000 a day for the next 18 months, which is over 40 times the current rate of infection. If our current death rate is 200/day, that means we could see 8,000 people a day die for 18 months, and that's before we consider the effects of overrun hospitals around the country.

I think this is why they're going to try to slow and control this thing with a series of rolling quarantines until we can get a vaccine. Otherwise, the math is pretty grim.