That's not really established for COVID-19.
Also, endemic doesn't mean something doesn't matter. In much of Africa, malaria is endemic.
What you mean is "As a society we stopped caring."
E.g. I see lots of young not wearing masks to protect themselves, and I see more older people protecting themselves with masks. Seems like a reasonable balance.
https://www.medicalnewstoday.com/articles/pandemic-vs-endemi...
It does not describe severity. Ebola is endemic in parts of Africa. I still hope nobody gets it.
We can change the meanings of words for political reasons but who do we do a disservice too?
Given that it is a word from my mother language I find it a bit insulting when politicians decide to change my language though to benefit for a year or two.
Tl;Dr: Saying that covid is "endemic" to the whole world, is an insult to my ears, logic, and a whole language and people. They should pick a different word if they want to disagree with doctors worldwide.