Sure, it's a valid threat but the viral history evidence here points to something other than a lab leak as the source of this pandemic.TheReport.com, the website of the Bulletin Of Atomic Scientists (the organization that publishes the doomsday clock status) published an article about how human error at a virology lab is the most likely source of the next pandemic. Published February 2019.
https://thebulletin.org/2019/02/human-error-in-high-biocontainment-labs-a-likely-pandemic-threat/
Nature is usually a lot more deadly. COVID-19 is actually pretty mild on the contagion scale.
https://time.com/magazine/us/4766607/may-15th-2017-vol-189-no-18-u-s/
The consequences of a major pandemic would be world-changing. The 1918 flu pandemic killed 50 million to 100 million people–at the top end, more than the combined total casualties of World Wars I and II–and for a slew of reasons, humans are arguably more vulnerable today than they were 100 years ago. First of all, there are simply more of us. The number of people on the planet has doubled in the past 50 years, which means more humans to get infected and to infect others, especially in densely populated cities. Because people no longer stay in one place–nearly 4 billion trips were taken by air last year–neither do diseases. An infection in all but the most remote corner of the world can make its way to a major city in a day or less.