Earlier quoted context omitted.
It's got to be something like how much of the population are getting sick. I presume when a disease is endemic you have a fairly steady rate of illness and death taking into account seasonal variation. Whereas right now covid still seems to be spreading quickly through the population and causing large numbers to get sick at once.
When I think about this I think of two parts of it. First, there are other endemics. Influenza is one of them. In the US along millions get sick from it and tens of thousands die each year. We live within that realm. There will be people with different degrees of risk and levels for being ok with going back to "normal" as COVID-19 is just out there. How do we decided (as groups in the world population) what we are ok…
In terms of risk management flu is a good example because most humans encounter various versions in childhood but we still offer vaccination every year against the most likely variants. And we can still have flu pandemics. It's largely in a steady state though but the reality of that means we actually need to do a lot of management as risk profiles change locally. And largely this is a medical issue not a political one.