Less efficient not only in fuel consumption, but also in road consumption. A while back Texas A&M did a road study on how traffic is effected by these large trucks. One finding is a stop lights they take about 1.5 times a long to transverse as a car. Check which cars make you miss the light next time you are trying to go through an intersection.
MS is a public firm, so if XP is losing money, and share holder value is not being honored, then yes MS has every reason to kill it.
But if customers are still finding enough value to pay MS to support it, then MS is just making arbitrary decisions that are hurt long term value. If business customers are not going to be able to trust MS to support core technology that is good enough, they will go somewhere else. Business customers can't be expected to change their business models just because MS want to sell a new toy.
As far as advertising naked internet webcam show for pay to kids, yes this is illegal, but face the facts. If a kid is interested in modeling, the most likely way to make money without allowing oneself to be physically molested and becoming addicted to drugs and actually making money is the web cam route. It is not ideal, but I suspect most of these ads are not for any kind of modeling career, but scams to separate parents from the hard earned money, and sell young people fake dreams.
Therefore, the best way to keep you conspiracy secret is simply have discussion while you are engaged in sex, or make sure that all participants are at least naked the camera prominently display the naughty bits. These will be deemed to be simple pron, and the terrorists will be free to plan the bombing of whatever place they desire.