I thought I made it clear with the rhetorical question, but there is no management at Valve due to it's flat structure. At least not in the traditional sense; it's staff are self organizing.

It's true that entropy will be the end of us all but while there are definitely things that may end Valve, "management" leaving isn't going to the thing that does it. It might be wise to learn about the company you speak so definitively about, I suggest reading the pamplet.