Thats kinda my point, the shared type certificate is most of the justification for the airplane to exist, Boeing would rather build a whole new small aircraft,

Thats kinda my point, the shared type certificate is most of the justification for the airplane to exist, Boeing would rather build a whole new small aircraft, people who fly on them would rather fly on a whole new aircraft - airlines however strongly prefer something that costs as little as possible to put into service - and has commonality with existing fleets, which means not a whole new aircraft. I bet if you offered Delta some brand new MD-95's they'd take up on them, as they have basically every MD-95 produced.