Norwegian Air says something troubling

Boeing had better light a fire under development of this aircraft and quit "tudying" the issue. The 737 appears to be maxed out. The 757 designs undoubtedly still exist and with new materials etc might be faster to reconfigure wings, engines etc. The result may not be perfect but will be a substantial improvement over the classic and the A321. It will give time to create a completely new product.

Also http://finance.yahoo.com/news/one-boeings-most-important-customers-154530605.html?status=verifyfail

This problem started many years ago when Boeing allowed one customer to drive their future narrow-body development plans by insisting on new variants of the 737 rather than a new airframe. They're going to pay the price for that decision for a long, long time.

Airbus out-maneuvered Boeing. The Max was a short term fix when they really needed some clean sheet designs. The 320 family is killing it. It's like a chess game and right now Airbus is playing a better match. Boeing needs a new MoM plane announcement right now, followed by a new replacement for the 737!