It plausible because, Facebook just spent 2 billion dollars to get into that market, any investor will want Sony to at least have some presence there.
They have all the incentive in the world to do so. If you buy a Morpheus/Camera and Move to use on PC, it also makes a purchase of the PS4 much more attractive since you already have all this gear and there will be certainly exclusive VR content on the PS4.
It opens many doors for Sony. In the end VR isn't only about games, Sony knows that. To succeed they will either have to open the PS4 for all kinds of application including experimental demos, porn, unfinished software (things that they certainly wont do) or allow for their product to have a pretense in a more open platform.
They have SOE making PC games, its not like Sony is against have a presence in PC gaming.
Keeping the Morpheus restricted to PlayStaion 4 is like making PlayStation exclusive TVs.
That makes no sense whatsoever. VR isn't just a screen.
There is no proof that VR would even be a popular mainstream product. There is no reason right now for Sony to believe that they need presence in the market. It's a peripheral/platform similar to Kinect, at best. Of course they see it's potential for PS consoles, and that's why it exists.
Facebook can do whatever they want, unlike Sony. They can invest billions in a potential market and shrug it off if it doesn't pan out. Sony can't.
I could go on and on. There is no rational, reasonable argument to support a plausible scenario of Sony selling PC VR hardware.
Who knows. Facebook might very well "do the Apple" and require that applications for Oculus Rift can only be distributed of an App Store (with content restrictions) owned by Facebook and requiring a Facebook account.
There was already an official statement from Oculus stating that their official portal isn't going to be required.
Sony would be dumb to not release it on PC.
I'm not sure how you get to these conclusions; but I disagree.
Common sense. Sony's business model is for them to sell games. That's why they have the best game studios in the world. VR would be a platform- games would have to be specifically designed for that hardware. If they don't sell a lot of the hardware, they don't sell a lot of games for it.
As for the FB account, it would be asinine to require it, for one thing. It would be counter-productive for an emerging market to alienate potential customers for such a stupid reason. Many, many people do not want their personal information out there. Many people just don't like Facebook- that's actually one of the reasons behind FB's choices in acquisitions. Obviously, it's in FB's interest for Oculus to be successful.