I hope for MS, that they learnt that you should not listen to what your customers are asking to satisfy them, as they don't know themselves what they want.
Like for women, they should look at their customers' behaviour to try to discover what they really want.
This expanding disk size looks like a hugely bad idea.
Of course, the movies DLC was a stupid idea already, as the XB360 is supposed to be a console, not a PVR. But no need to go on the stupidity path by adding a bigger HDD, and yet another SKU.
XB360 is now seen as unreliable in several ways. All these SKU go against the idea that a console is reliable. Remember the first SKU ? Those that bought them were screwed in every way. It also shows that the MS had no clear strategy on what to make with their console from the start. That doesn't convey an idea of a reliable company for a console.
So my take is they shouldn't do this. I'm already thinking they run scared in pacnic mode since some months, now that would only be a validation to me, and surely countless customers could feel it.