Now that i read this with more time, i think the omniviewer thing is an incredible risk, but given it optional its a smart initiative marketing wise. This will differentiate the Playstation with a tech that is only found in it, just like kinect with the Xbox and the tablet controller and motion controls on the Wii U.
I am glad its optional, because personally i dont want to get it. I dont think its gonna be very confortable or good for your eyes.