Good points Chinapattern.
I last flew Delta MAN-JFK in 2000,In J class, - full in both cabins- .B763. The 767 also has a nifty cargo capacity- whereas the 757 is seriously lacking.
They allowed a well supported product to fall apart for the reasons Chinapattern says. 14 years later, & it looks very much like some
PR & tinkering & then the inevitable.....