I’m guessing this is the most accurate analysis:
“McKiernan warned last year that a satisfactory outcome would take a decade, perhaps 14 years. For his political bosses, that was way too long.
The changes in command underscore the impression that Obama, abandoning long-term nation-building goals, is looking for quick, minimalist results in Afghanistan, chiefly containing and deflating the insurgency. His aides don’t want the war dragging on when he stands for re-election in 2012.”
Similar to the kind of warnings Shinseki was giving Bush prior to the Iraq invasion, and look what happened to him.