I think we need to be looking at Occam's Razor for PS3 3D - the simplest solution is most likely the one they'll go with.
Here's the HDMI 1.4 spec page for 3D I alluded to earlier:
http://www.hdmi.org/manufacturer/hdmi_1_4/3d.aspx
Notice how the top two methods in the list are those used by Blitz Games in their XBLA/PSN game. Surely creation of two frames from one is the most sensible solution? I'm willing to bet that interpolation of a stereo 3D image via goggles helps make up the resolution deficiency - the eyes naturally blend. Also consider PS3 running in 1080i mode - it can still give the
impression of 1080p60 even though it is producing half-frames.