I had wondered if a bridge order to keep Boeing's 767 line going might be the answer to a 4,000 mile 757 replacement. Sadly, according to one analyst, the answer is no and despite their significant limitations the A321NEO and 737-900 Max are the best the market has to offer right now.
Even with the latest and greatest 767 mods, it is about 20 percent more expensive all in than a narrow body jet.