I guess people misunderstand my comment - I am not saying 777 (or any other plane) can withstand the SAM. It's remarkable that in almost 20 years in operations all over the world, only a very small number of planes have been lost.
Other than the unsolved MH370 crash, I don't think the B777 has ever had a fatal crash that wasn't pilot error (Asiana crash at SFO). It's probably the safest passenger aircraft ever built.