The HL3 memes don't even seem fair to use anymore. I don't even want to un-seriously make joke fun of them at this point. They are just genuinely doing so much for the community.
I hope Gabe has setup Valve in such a way that they can pass on his mentality as a whole inside the business practices themselves. I think, after all these years, he must have surely thought about what leaving would look like for Valve. Considering this is a guy who seemingly thinks in decades, I feel maybe even optimistically calm about it.
I'm a huge fan of the OSS model of keeping your core business fully unrelated to OSS but allowing and encouraging the use and contribution to OSS by people on your payroll because it really is a rising tide effect. There are just too many stories of a cool project becoming a company only to eventually reverse-robinhood the project into a closed source for-profit product.