The number of cases in China was been steady for around a week. If we extrapolate from Hubei that should give a decent picture. Around 0.1% of their population were diagnosed with covid and of those diagnosed around 4% died. If we apply the same rates to the United States (328 million * .001 * .04) we get 12,960 deaths. Keep in mind that is somewhat of a worse case scenario. In Henan province the fatality rate is less than half of what it was in Hubei, 1.6%.
It's not a "worse case scenario", it's successful containment through quite strict quarantine measures. Since neither USA nor Italy are taking measures remotely comparable to what Hubei or Henan did when they had a similar amount of spread, we should expect these countries to have a much larger spread than Hubei did, it's really not reasonable to assume that they would be able to limit this to "around 0.1% of their population were diagnosed with covid" - it's plausible that more than half of the population could get it, and leaders of many western countries have acknowledged that.
The population density of Hubei is over 9x that of the United States, the quality of care is better in the United States, and there was basically no action taken for the first 2 months of the outbreak.
"it's plausible that more than half of the population could get it, and leaders of many western countries have acknowledged that."
Will there ever be apologies for spreading mass hysteria?
Will there ever be apologies for downplaying justified warnings and saying "it's just the flu" with dire consequences?
E.g. in a recent turnabout Vice President Mike Pence said today that there has been “irresponsible rhetoric” from people who have downplayed the seriousness of the U.S. coronavirus outbreak.
Let's look at South Korea. The number of daily cases has been declining for a week. There are currently 7,869 cases there. Let's just say that despite the current trend the number of cases manages to increase to 20,000. That would mean around 0.04% of the population of South Korea would be affected. They currently have a death rate of 0.8% but there are still many active cases. Let's say that doubles to 1.6% which would put it in line with regions of China other than Hubei. If we apply that infection rate and mortality rate to the US population (328,000,000 * .0004 * .016) that gives a total number of deaths of 2,099.
The numbers don't need any mitigating factors but those do exist as well. I don't see South Korea doing anything more extreme than what could be done in the US so that doesn't show the US would be worse. The population density of South Korea is 15x that of the US so that would probably mean the infection rate would be lower in the US. The median age is also higher in South Korea and since this disease affects older people more that would also make the outlook for America better.