What supporting infrastructure would have to change? Jetways are compatible across a wide variety of planes. Yes, you can't use the same jetway on an A380 as a 737 (the A380 is just way too big), but you certainly can use the same jetway on a 737 as on an A320, and many other planes besides.
The reason they didn't want to do a clean sheet redesign of the 737 was to avoid pilot recertification, not because of ground infrastructure. Airports are already used to servicing dozens of different types of planes. Adding one more to the mix wouldn't materially change anything.
The reason they didn't want to do a clean sheet redesign of the 737 was to avoid pilot recertification, not because of ground infrastructure. Airports are already used to servicing dozens of different types of planes. Adding one more to the mix wouldn't materially change anything.