What would you do if one morning in your city you found out that there are confirmed cases of a new illness that rapidly spreads among citizens, and let's say killed 15 people?
What if you saw on Facebook that in your neighborhood, in some mall, for example, a few people passed out and people said it is because of that illness?
What if you read in the news that the virus is very contagious and it spreads by air very quickly?
What if you saw people rushing into pharmacies for face masks and medications, and into the grocery stores for food and water supply?
Would you continue to live as before or you would consider going into survival mode and stay home with your family, or to leave a densely populated area to go to your cabin on the lake?
Now, multiply the mentioned situation above by 10, so let's say the situation with deceased from the virus is 10 times worse, and so is the situation with panic and rushes to store and pharmacies, etc. and ask yourself this:
What do you imagine that people who are working in electric companies, police services, hospitals, fire departments, food delivery systems, public transport companies and elsewhere would do?
Do you think people working in areas that hold the system together would continue to go to their jobs or some of them might consider the option to go home and take care of their families? Do you think the stores will remain stocked? Do you think everything will keep running as normal?
How large a number of those people would there be? How would that affect the system? Would that mean the system might collapse?
Well, nobody knows for sure, but I think there is a big possibility for that.
It's not the virus you have to worry about. It's the system.
Virus or illness on itself might not be a problem in its essence, but the impact that it brings to the system and people might be so huge through the media that it causes the system to stop working in the normal way. So you could find yourself in a collapse not necessarily because of a huge pandemic, but because of the reaction to it.
Another case might be the simple unwillingness from the system to admit how bad the situation is in order to stop the panic when folks realized the truth.
So, what might bring the system to collapse might be a real pandemic or a reaction to the pandemic (which might or might not be controllable) or simply the government's poor or late response to the pandemic.
I am not into fear-mongering, so I am not expecting an end of the world pandemic because the current virus most probably might be (like many times before) something that will be controlled with just a few troubles before it becomes a worldwide problem.