The biggest concern is health care capacities being overwhelmed. He died in a place under severe resource constraints, basically a warzone. Fatality inside Wuhan is 5%, the rest of china 0.17% and even lower outside the country. Regardless of how correct the numbers are at this point - available ICU capacity is probably the largest factor for fatality rates for the disease at this point.

Just like the flu, this virus causes number of very serious cases that require intensive care but care capacities in most countries are barely able to cope with a bad flu season before bed appear on hallways - and this year had a particularly bad flu season still ongoing. There are only so many ventilators and artificial lungs available in hospitals and there is limited capacity in the world to deal with a new, highly infectious pathogen hitting a population without any preexisting immunities and people requiring weeks care to recover and become non infectious

China has, for better or worse, sacrificed Wuhan to buy the rest of the country and the world time to shore up capacities and enact procedures to stagger the load that will hit healthcare systems if the virus becomes broadly entrenched. I don't think there is any healthcare system on the planet that won't severely strain if hit by the sudden load of a new, highly infectious virus with long, invisible incubation period.