How can Boeing claim they have been hurt in the marketplace when they (a) don't build an equivalent aircraft (there may be a 150 seater 737 but it's not on offer at the moment) and (b) they couldn't sell any 737s to a new customer for about five years even with their insane firing order (Boeing speak for production rate).
Plus there's the potential loss of American jobs in Pratt & Whitney, Rockwell Collins & Honeywell.