It's been predicted for a couple of decades in fictional/speculative form. Not a long stretch, given our population density, trade and travel, international animosities, and our assault on the last remaining wilderness.
It's been in the public consciousness since the bird flu scare; even more so since the coronavirus showed up in NA, causing SARS
All the health experts knew that a bigger and meaner variant would follow at some point. Most of the national and international epidemiological agencies
laid out preparedness plans and recommendations.
https://www.who.int/influenza/...
https://www.cdc.gov/flu/pandem...
https://www.canada.ca/en/publi...
Governments were less assiduous in following those guidelines than they should have been - one president notably scrapped the existing plan - and made no serious contingency plans for the economic fallout.
Nobody wants to rock that boat until it's actually sinking!
And we could have learned all of this from the movies.
https://www.vulture.com/2020/0...