Thats actually fucking shitty...
I really wonder what happened to Palmers "For VR to succeed it must be open."
Naturally. Oculus is now in a completely different position when they have Facebook behind them.
I understand having an open source boner, I get it and I also support open software. But I don't see Valve having a choice here, they need to support the Rift.
Let me explain my view:
The situation is that there's a huge new industry booming and Facebook has decided that they want to dominate it.
They have already spent billions to acquire Oculus, establish new R&D facilities, fund games for their platform, sell their HMD at cost and it seems like they're ready to do a lot more to ensure their position as the leader.
Facebook has millions of Gear VR's (with a large Oculus logo displayed on the unit) on the way to Samsung customers, we talk how we want VR to succeed and be available to mainstream but
they're already there. Even here in my tiny country I can walk to any major phone retailer and get me a Gear VR from the stock. They're also going in hard for social VR which will be huge.
Valve's current partner HTC is a tiny fly compared to both Facebook and Samsung, they're also in deep financial troubles.
What if HTC decides that Vive is not profitable enough? They can't afford to keep it going for long without profits, maybe not even develop another HMD. Valve would be fucked if they need to start again with another manufacturer, and they know it so they're betting on software + maximum compatibility of SteamVR.
Even if they have good tech Facebook has the money and the world's largest marketing channels in their control. Zuckerberg personally can write just one post and he reaches over 52 million people instantly. I would say they have a huge edge, even without room scale or touch controls during launch.
Considering all these facts it's just smart for Valve to also support the Rift because they're in the business of selling software, they already dominate the games marketplace via Steam. But even with that on their belt it'll be difficult to win Facebook in the HMD war. Better prepare for possible defeat on that front and try to make the best out of it by ensuring marketplace leadership via Steam.
BTW remember when Steam launched and people didn't like how Valve tied HL2 and CS:S to it? They had the means to gain userbase / brand recognition and used them, like Facebook is doing now. It's all just business in the end.
TL;DR:
The actual battle here is Oculus Store vs Steam, as someone said before. On that front Valve can actually compete so it'll be their focus.
Also if people think that Facebook doesn't have anything open source and is pure evil, see:
https://code.facebook.com/projects/