I think there could be a big demand in developing areas: Africa, SE Asia, South America....especially places where it takes a LONG time to deliver stuff via ground, and air transport is the only viable solution.
Flying an MD freighter is WAY less expensive than flying a 757. It is also less expensive than a DC-9, as they can hold a lot more, fly further, and burn less fuel. I think that they hold more than the 737 freighters, and between the initial cost and the cost to pay pilots, I think the MD is the way to go.
cliff
ANC