That 80,000 assumes agressive self isolation and hospitals will not exceed capacity and have to let savable patients die because they don't have the ventilators. With COVID-19 the number of people who have life threatening cases and require hospitalization or they will die is much, much higher than any flu outbreak since the 1918 flu.
Look at the hospital situation in many places that are hardest hit. In some places in Italy they have had to let savable patients die because they didn't have the ventilators and other resources. New York City, Atlanta, and New Orleans are on the verge of that point right now with cases growing in every city.
If we do aggressive self isolation, we can keep the death rate down to 80,000 in the next four months. If we don't, there is a study out of the UK that showed if the virus was allowed to run its course. In the UK, they would see 500,000 dead. The US in the same scenario would see 2.2 million dead. We would be done with the virus by mid to late summer because almost everyone left alive will have had it and gotten over it.
Then there are the long term consequences. There is news coming out of China that about 20% of those hospitalized who recover have permanent heart damage. Some percentage (probably fairly high) will have permanent lung damage too. About 68 million Americans are vulnerable to get serious cases. If all of them got it at once, a huge percentage of them would die and most of the rest would be left with permanent, chronic health conditions that will require treatment the rest of their lives.
If you want to see millions die and the economy melt down for a generation, go back to business as usual.