Airbus put all their eggs into one basket that has caused major aerospace companies to bail out of commerical aviation on more than one occasion. On top of that, said basket has very few parties that can justify it. Boeing, on the other hand, chose to go to a market that was already in existience and hasn't been touched in 20+ years. The same market appeals to airlines of every size regardless of cargo or passenger.

Now the next big question is who will jump into the 737/A320 market replacement.