I was looking at the Rest Of The World/cases outside China chart on the Johns Hopkins map portal earlier, and yes...I would say in 40 days the US could easily have 250,000 to a million cases. The potential seems to be there.
They say that Washtington state could have 600 to 1500 cases right now. I think it's possible that the rest of the US also has that many. With a 5-day doubling rate that gives 3000-6000-12000-24000-48000-96000-202,000-404,000-808,000 for a simple 40-day projection. What happens in terms of actions taken by cities, states, and individuals could bring that down. Alternatively, the Johns Hopkins chart for non-China cases seems at the moment to be showing a 4-day doubling rate, so the 500,000 to a million cases after 8 weeks could be realistic. But hopefully actions taken during this time can keep that number to the lower predictions?
One thing that's going to help to reduce the doubling rate and the R0 is going to be more in depth testing, especially for patients entering and admitted into hospital. Getting infected patients into isolation/quarantine areas will hopefully reduce infection rates in healthcare staff and other sick patients, and reducing the cases spread to already sick and vulnerable patients in hospitals will help to keep the death rates down.