Well boeing will no doubt build lots of them whatever is said on here
It words and its economical despite being basically 50 years old on the surface.
Massive commonality issues for mega users like Southwest and Ryanair and i think that sort of thing decides whether an airline buys Boeing or Airbus a lot of the time for single aisle aircraft. (of course some huge carriers buy both)
Theres' not alot of difference except in the comfort stakes where unsurprisingly the newer AB design wins hands down being designed for the larger frame pax of the end of the 20th century not the slimline folks of the 50s . And if you have been on the two flight decks the AB advantage is even greater unless you are wedded to yokes.
However pax comfort is not somethign the airlines give a toss about and crew comfort comes even lower down the list and so we will soldier on until 2040 or so with much the same designs as have dominated the airways and gate spaces of the world since the 1980s