At the end of the say, Southwest doesn't really have an alternative. If Boeing comes out with a next generation 737 replacement, that is significantly more fuel

At the end of the say, Southwest doesn't really have an alternative. If Boeing comes out with a next generation 737 replacement, that is significantly more fuel effizient and no new version of the 737, then what is Southwest gone do? Never upgrade their planes? Go from all Boeing to all Airbus? Even when the 737 replacement has better economics then the A320? If Boeing were smart they would have bought the C-Series, and added the C-500 model quickly. That would have been the perfect plane to get all the 737 people to switch. Instead Boeing handed those planes to Airbus, and now Airbus has 2 planes better then the 737 Aax.