Prediction: Boeing will launch the NMA/797 and it will become a massive success.
Why? Because, as the world ontinues to obsess over aircraft emissions, tankering etc., the 797 will offer the lightest, most economical, 5,000 mile range, 220 - 270 seater - capable of linking any city pairs in the world with one tech stop: saving truly massive amounts of fuel and emissions. Yes, there'll be the cost of the stops and increased cycles etc but airlines won't care about that because their punters - and the world at large - won't: they just want to be seen making huge strides on the emissions front. Slightly tongue in cheek but if tech stops reduce overall fuel burn through eliminating the weight of tankered fuel, why not go the whole hog and eliminate the weight of the airframe no longer needed to carry it . . and the weight and thrust of the engines no longer needed to propel it?