How do you reach these conclusions. All they discussed was the aspect of it being much better for content creation that the original engine. Valve doesn't need anyone to adopt it, its just an engine at no cost - any money made is through Steam with a final product as any other game.
True, but see the bigger picture and not just the monetization: Valve (unlike the other VR vendors) will -ideally- be able to offer
- the VR hardware
- the VR software (even if it's only ports and not Gordon Freeman 3)
- the VR controllers
- the VR Steam machines /Hardware
- the distribution model (Steam)
It only makes sense to push/entice its own
- VR middle ware, Source2
onto third parties, to ensure that all of these components work well with each other.
Knowing Valve Time® this will probably not all work flawlessly, immediately and right out of the box (then again, what does?), but Source 2 can (but actually MUST) connect the underlying infrastructure in an easy and cheap way.