Mistake. The new planes aren't big enough. I've flown 747 with 600 people on board. Routinely. In the Middle East, Asia, hajjing and what not, carrying big numbers, you need that capability.
Plus, just looking at the delay with the 777x, has the big twin concept maybe got past the point of diminishing returns?
Plus, this business of taking twins over the North Pole and down into Antarctica is going to end in tears sooner or later.