The games division, though, helps other sectors, like movies and music, offering Sony the opportunity of running its own market for them, while TVs, OTOH, besides losing tons of money in the mid and low range, don't offer that advantage, as TVs are totally general purpose devices, it doesn't make any difference for movies and music markets whether the TV is Sony or not, so cutting TVs, completeley, or where they lose money, makes sense a lot more than cutting consoles, that just need to have R&D costs kept under control, so that each new model become profitable within an acceptable time.
As for PS4, the best choice for Sony will be to keep a low profile: focus on PS3 late life, with low costs and high profit margin, as long as possible, design PS4 using standard components, and to be just a little more powerful than competitors (mainly having some more RAM), but launch it last, one year after XB720, so having lower costs at launch.