I think this post massively overestimates the power a CEO has. The CEO is beholden to the shareholders. Valve is private, ~~so~~ and its shareholders are its workers. It would be useful to know how many shares Gaben has of valve, but I still don't think the next CEO would suddenly also be the majority owner.

Also, I know things have changed a lot in the last 12 years, but 12 years ago regarding the total dissolution of Valve, Gaben said:

“It’s way more likely we would head in that direction than say, ‘Let’s find some giant company that wants to cash us out and wait two or three years to have our employment agreements terminate."

Also, forcing users onto windows is THE way to kill valve's profits. The whole point of the Linux push was a direct response to the windows store, and msft's threat of forcing valve to give them a cut of purchase through steam. Msft will still do that the first chance it gets. So even the most profit-minded new leader wouldn't make that choice, as it's plainly shortsighted.