Let's talk about Boeings product strategy:
Boeing seems to be a typical American company: the only thing they have in mind are the quarterly results. So they try to optimize their balance sheets to satisfy Wall Street. Nobody thinks about a clear product strategy.
Or why did they develop a B-737NG instead of developing a completely new 777-style narrowbody aircraft? They were lucky to secure some large orders from US majors. But there is no bright prospect for these aircraft in the future.
Why did they develop the B-767-400? Because they could secure orders from DL and CO in order to satisfy the analysts for a couple of days. No orders followed up to now because nobody wants to invest in old technology.
Then you have the 717. This aircraft is completely out of any commonality with the other Boeing aircraft.
The 747 again lacks of any commonality with other Boeing aircraft. And they once again want to upgrade this old bird!
Boeing seems to make the same mistake McDonnell Douglas did in the past: They only try to satisfy their short-sighted investors and completely forget to invest in the future, e.g. building up a product line with high commonality.
If Boeing don’t change it’s strategy towards a longterm optic, their market share will further diminish and I expect it to be around 30% in five years time.