The Ps3 must be one of their biggest mistakes to date. I mean, Who in their right mind would want to pay �400 - �500 for a games console, when You could pay �180 for a Wii, which has so many advantages over it! and if theyre looking for an old fashioned console, with great graphics, theyll go for an Xbox 360. I honeslty think Sony would be more profitable if they developed software, and not gaming hardware.
Besides, i do remember reading an article that they don't plan on making a 'PS4'. Sorry, i dont have a source for this, but im sure it'll be on IGn or the bbc or something.