This is a Stupid Idea

Boeing is proposing a C-17 variant with a 4 foot narrower fuselage, the theory being that if it is too expensive to operate, this model will be a bit cheaper, though it won't be able to carry (1) Abrams tank or (2) Bradley IFVs, though it could carry Stryker class vehicles.

Unless this is some sort of idea to get some more pork through the US Congress, this is a stupid idea.

While the reduction in takeoff weight, as well as an increase in installed thrust, it will still be outperformed by modern turboprops, and in terms of economy per ton mile, low wing commercial freighters will be cheaper to operate, as well as being about 50kts faster.

It just doesn't make sense.