And therein lies the fatal flaw with an all composite commercial airplane, within the first year of flight service some minimum wage baggage handler will drive his forklift/cart/etc. into the aircraft, fearing for his job he'll tell no one, after a few cycles the damage will have spread far enough to become catastrophic, at which point the 787 will become Boeing's "Comet".
A much better choice would have been a hybrid with Al for the lower body and composites for the rest...