I think at this time, it's basically a foregone conclusion that 60-90% of the world population are going to get the virus. Figures are also showing that around 30% of cases require medical intervention.
A primary concern is obviously the mortality rate being (by current estimates) around 10 times more lethal than the flu. China is showing around a 3.4% mortality rate (34 times more lethal than the flu).
While it's true that there are going to be mild cases that don't get reported, it's also undoubtedly true that some people are dying without being tested. I think the CDC is aiming at a pretty good point thinking the actual mortality rate is around 1%, at least with the data we have currently.
That means when all is said and done, worldwide:
4.62 - 6.93 billion infected
1.39 - 2.08 billion requiring medical support
46.2 - 69.3 million dead
These are very fluid estimates. A mutation could make things much worse. A vaccine or improved testing and treatment could help stop or slow the progression.
We have to be smart. Don't panic, but take precautions. Wash our hands, stay away from crowds, don't touch your face. The economic damage is going to be just as scary, I think, as the virus itself.
But we'll get through it. One thing our species is fantastic at is closing ranks in the face of a common enemy. Remember that everyone is scared right now, and try to be patient and caring of those around you. The main goal now is to slow the progression enough to keep our health systems from going under water.
Good luck, everyone.