I applaud speculation, but there is a stunning naivete going on in this thread. Microsoft and Nintendo are unlike Sony in that they aren't collectors. They prefer to subcontract out, build their own studios, or bulk up existing studios. To be blunt even if a really good Sony studios were up for sale. Neither party would be apt to buy unless it was priced at a substantial discount. Both Microsoft and Nintendo have substantial reserves of capitol, and haven't utilized that to go on a acquisition spree this generation. Even when it would have been a real shot in the arm for their lineups.
What is even more troubling is the naivete when it comes to how Sony operates. Sony is actually more apt to go raze its studios before going to the trouble of selling them. Sony views assets as expendable rather then as long term prospects for resale. Sony is more slash and burn then it is conserve and nurture. The net result is that Sony streamlines studios to suit their needs, and their needs alone. Making them a hard sell to other companies. Which brings us back to the point studios are like food to Sony. The company eats studios, and what comes out the far side is nothing like what came in the front. Sony really does eat its own. It just doesn't maintain a high resale value.
As for the talk about Apple I am not sure where this thinking is coming from. Apple doesn't need any of what you guys think Sony has, and if Sony is performing poorly. Then why would Apple want to acquire Sony. It wouldn't even be a good fit remotely. I will say this however the Japanese populace would probably be supportive of say a Western company acquiring Sony if the alternatives are bankruptcy, or it being acquired by a Chinese company. If you don't understand what I am getting at just look up war atrocities.
Anyway all this talk about Sony selling studios that would have to be sold at a severe discount seems premature. It is just antithetical to the entire situation. In both directions no less. Selling studios isn't in Sony's nature, and the market for what they have would have to be fairly soft. Sony isn't in great shape, but I don't see it as being in such a desperate state.