Only trouble is the ceo of Boeing isn't the best or the brightest. This overpaid wind bag has presided of the most hideous industrial meltdown in recent history. Virtually every major program has been canceled or is woefully late. The only positive that can be said about boeing is its one and only competitor is a european government-subsidized jobs program. Even airbutt had to take the lead on re-engining the B737 - A320 size program to keep the newcomers at bay. By the way, why does it take 5 years to re-engine a plane that has been built for 40 years.
I was making a generalization about CEO. The engine question, not sure, but it could be because as engines have evolved they became high bypass type engines, which means a lot of air isn't going into the engine it's getting pushed out the back for thrust. These have increased in size over time and I would assume to some degree might be heavier and that might mean a re-design of the wing was needed. Who knows. You're right on many points. The Dreamliner took forever. It's as if Boeing knows it only has to be a tiny bit better than Airbus to succeed.