swh,
It's all about the wing. I thought you, of all people, would know that. Boeing is not doing the folding wingtip because it looks cool on the ramp. There are very legitimate concerns about the payload range of the -1000. Why do you think they had to change the wing (from the -900)? I'm not saying this necessarily had anything to do with the EK cancellation, however.
That's the difference between Airbus and Boeing. Boeing builds structures with adequate margins for growth and error. Notice how the 787 wing will fly successfully on three aircraft, the 777X wing on two, and the A350XWB wing on, well, one. The A358 won't be built and the -1000 (or -1100 if you believe the hearsay) will require a bigger wing to have anywhere close to the brochure range.
Btw, I thought you were properly discredited in our last exchange wrt SFCs and "the bucket" on engines. You are clearly a novice pretending otherwise. Save your propoganda for the uninformed.