I am not a medical specialist but what will happen next seems to be a matter of common sense;
1) The genie is out of the bottle. One traveler on the Diamond Princess spread the disease to 285 people in the closest monitored example of how this spreads. There was an infected traveler on the Westerdam ship, the other passengers are now flying all over the world. The Chinese haven't been able to contain it with draconian measures, western liberal and impoverished third world countries have no chance.
2) ICUs of first world countries are matched to normal demand. They won't be able to cope with this.
3) Authorities will change the rhetoric from trying to control the spread to accepting the inevitable and dealing with the consequences.
4) The scale of loss of life will depend upon how quickly a vaccine is developed and how well people reduce spread by staying home.
Travel should be minimised until a vaccine is developed. Tourism, olympics, public meetings etc should be postponed.
