And exactly this is their problem. The other article was stating things from the investors point of view. They are in fact rallying support against parts of the Sony Management. Sony will have to react or they will get huge bills from their investors.
Although I doubt that they will sell complete parts. At the moment you wouldn't get real money for them. But Sony will have to cut costs and earn profit in the short term badly. This will probably lead to several important steps for their gaming department:
A low cost initiative for the PS-3. The console has no real chance to earn back its huge investment costs, especially the cell developmant. Its costs were parked all over the place.
At the moment it is in a good situation to earn at least a part of its money back. They are in no postion to compete with the Arcade Xbox 360 now or in the long run. So it is a more prudent step to try to earn some money back and invest it in a PS-4 project. The PS-3 might sell sufficiently for 2-3 years and then you should better have an alternative. Otherwise the Wii 2 and Xbox 720 will crush you between their previous versions and their new plattforms.
On the software side the situation is quite clear. Lots of their staff will want to go into the multi plattform development. A bigger market and rather minute additional costs. All the expensive exclussive projects have trouble to even meet the break even point. Only exclussive titles in very advanced stages will stay exclussive.
From a pure software development standpoint this is the best and easiest way to earn profit on HD plattforms. Especially if Microsoft succeds in attracting casual gamers with HD interests. Do you really believe they will wait till your console drops to their price point or will they take the 200$ alternative, even if they get slightly less attractive games but they can play them now, not in one or two years.