The baseline 20t FCS MGV weight goal was already being 'reviewed' in favor of a 24t vehicle by the fall of 2003, well before the scourge of IEDs had made itself felt in Iraq, so for the authors to blame FCS weight growth on the war is disingenuous at best. What the lessons of Iraq have done is to further stretch the vehicle's weight towards 27-28t.
The UK is in a little better shape with FRES - should it survive development - since FCS was initially constrained by a C-130J transportability requirement (later dropped). The pacing issue is whether you want to be able to drive a battle-ready AFV off of the A400M and into action, or whether you are willing to spend a couple of hours bolting on armor and mission equipment.
I/C