I think that it's more about tactic and structure than about equipment.
The Rumsfeld concept of transformation was to capitalize on the U.S. advantage in high technology. Armor was not important as our intell capability would give us such an edge in situational awareness that we could destroy enemy forces with precision munitions at ranges in excess of enemy capabilities. This model of "transformation" was actully based on the idea of a conventional enemy whose equipment, facilites, and tactics lent themselves to detection through technological means.
In fact, based on this model, Secretary Rumsfeld was pushing for a 20% reduction in the Army (10 divisions down to 8) shortly after he came into office. The idea was that we didn't need much ground combat capability, just a few ground "spotters" to help round out our technical capability to acquire targets for our naval and air forces to hit. The green beret elements fighting the Taliban in Afghanistan were the supposed exemplar of this model.
The early Rumsfeld model of transformation was actually based on an old model of warfare and therefore did not fit the realities on the gorund in Afghanistan and Iraq. When the enemy operates in dispersed, small units intermixed with the civilian population and using guerilla style techniques and tactics, close and unexpected engagements are the rule--that means armor for protection and lots of well trained ground troops to hunt down and eliminate the enemy in detail. While large amounts of ground troops equipped with both personal armor and moving in armored vehicles is not transformational, it is effective. And effectiveness is what we need.