Losing the consumer game? Their 90% PC marketshare hasn't wavered despite Windows 8, and their mobile marketshare is growing consistently. As the presentation says, your perception of them seems to be incorrect, and it addresses the consumer side, though less so than the enterprise side.
Not really, they addressed the consumer side of the equation in a way that Microsoft has not, at least yet, perused heavily. Their rationale was that Android+Windows hybrid devices are the future for MS in the consumer space. If you're aware of MS' official strategy, or even any serious marketing efforts, going down this path I'd appreciate you sharing them; honestly.
The PC market share isn't going to go anywhere magical, no. The reality is mobile is where the growth is. The PC will keep its stronghold in the office and among professionals, but consumers will continue the trend that has been underway for at least half a decade, possible longer, of moving to lower cost consumption oriented devices that are portable. The average consumer isn't clamoring to go buy a computer and if they have one they are upgrading them very rarely. On the other hand, they are clamoring for newer tablets and phones on a yearly basis and adoption is going through the roof.
Microsoft may very well end up being the behind the scenes leader, as I suspect they will, but they won't be as known as they are now by consumers unless they did something magical to get mindshare back.