Maybe they are spinning such negative news because, by perception of value, they are trying to keep the stock value low so as to buy up as much as possible before 2017, which is when Microsoft will supposedly focus more on Windows mobile and perhaps will start to see a gain in market share (fingers crosses)
I really don't think Microsoft can afford to kill Windows mobile for the very fact that technology, as it gets more powerful and capable, it also gets smaller which has been the trend since the beginning of computers. For Microsoft to kill windows mobile would be the same as saying no to their own future. I think for the most part, we can consider the constant statements of Microsoft abandoning ship on windows mobile is tantamount to enemy propaganda. No body wants to jump onto a ship that's sinking and if you can't really sink the ship then the next best thing to do is tell everyone that the ship is sinking. This is simply a platform war, and if people think a ship is sinking they're likely to jump ship to one that appears to be floating just fine. The other factor in this is, the naysayers could also have stock in the competitor and as such, risk also falls onto them to protect their investment, risk is no longer with just the competition, it's spread out.