"The Imperial College estimates 2.2 million deaths in the US if the government fails to take dramatic steps to slow the spread of the virus. Deaths would peak in mid-July."
– @Laurie_Garrett

Here's the full report:
https://www.imperial.ac.uk/media/imperial-college/medicine/sph/ide/gida-fellowships/Imperial-College-COVID19-NPI-modelling-16-03-2020.pdf