They stopped making the 757/767 range far too early! The extra capabilities it has regarding payload and range over the 321 would have ensured a steady longhaul market over the years. The only replacement for a 757 remains......a 757- it is a mainstay of our operation, yet there is absolutely nothing to replace it with. Boeing do seem to have made some extraordinary decisions in recent years (Sonic Cruiser, 747-800, unrealistic schedule for the 787......)