Valve Boss Gabe Newell has said in a video interview that the company is thinking about how it will start delivering Source 2 to those who want it, saying that for them it's "insanely useful" but mentioned that it probably won't be for everyone.
“If it’s useful for people, it’s available for them to use,” says Valve boss Gabe Newell. “For us, it’s insanely useful - it does exactly what we need an engine to do and it’s evolving in the directions that we think are important. It’s kind of an industrial-strength solution. For our developers it works great, for other developers it’s not nearly as useful as Unity. So it’s sort of like, it’s here if people want it.”
Newell explains that he views the Source engine's latest iteration as a tool in Valve's arsenal, and that it's part of Steam, so some parts of it will be useful for developers, and others won't.
"It’s not a way to make money for us, it’s something for developers to look at and think ‘wow, that’s exactly what I’m trying to do’.” said Newell.
Valve say in the video that they're working on getting Source 2 to the point it can be offered en-masse to developers that want it, but right now it's not a priority as they'd rather work on their own projects first.
There's a lot of information in the video above, I'd recommend checking it out for words direct from the man himself.