In Q4 2015, Q1 2016 we saw a lot of activity around the possible launch of a new middle of the market aircraft. Conner Boeing Aircraft CEO even stated he wants a plan this year. Which would probably mean a Boeing aircraft around 2023. Working names sofar are MoM, NMA, 797 and even a rewinged 737-10X is considered.
https://www.flightglobal.com/news/ar...-end-y-421802/
During the last few weeks however, the tide seems to be turning. One of the reason probably is Airbus making more sales and the 737 MAX prospects list for Boeing is shrinking, as are its margins.
A New MOM Aircraft? It?s the Economics, Stupid | Commercial Aviation content from Aviation Week
This will probably lead to Boeing looking for a combined 737 successor / MoM solution. In my opinion it is impossible to compete effectively for 170 seats 1000NM as well as 240 4000NM with the same wing / engine combination. Compromises would hurt efficiency in both segments.
A common fuselage might however work. While a single aisle might be impractical for short 240 seat flights (boarding/de boarding) and twin aisle e.g. 2-3-2 might make the aircraft to big/ heavy to compete with e.g. a A321 NEO an in between fuselage, 1.5 aisles, could cover both requirements.
