"Every person who isn't a murderer is just a murder away from becoming a murderer. Timebomb!"
I get your point, but this metaphor would be more applicable if historically every human on earth murdered someone during their lifetime. I think Steam/Valve will remain the same as long as their current leadership is in place. 999 times out of 1000, once the original founders are gone, any company begins the enshittification process, whether it's a major business like Valve or a local chain of grocery stores.