I personally doubt that the impact scenarios discussed latterly in this thread would down the Boeing. In the mathematical model earlier, the energies would be theoretically focused to contact surface areas. This would not happen, though such a hypotheses has to be built from some foundation of course.
The very nature of the structures involved would mean that the air would play a very significant part, not only in the destruction of these airfoils, but also in the dissipation of energies after collision: as the component parts were distorted and started splitting, the first leakage would cause an almost explosive swelling and resultant disintegration of the winglet before it had progressed very far into the Boeing's wing.
As we all know, many severely damaged aircraft have made it back to base, some older slower types having less than half of one wing left on a given side. There has to be a vulnerable and indeed vital component having suffered damage. Aircraft have so many Achilles' heels.