What led to the demise of the 727?

Demise?? Those airframes are still flying by the hundreds!! and for the reason that theyre a wonderful jet to fly, ask anyone whos ever had the pleasure to fly one. Two things that really antiquated them however were the removal of the F/E position and ETOPS. Now some 727's are being retrofitted with advanced avionics and are eliminating the F/E position but although the third guy in the cockpit is gone, the third engine still is. Im sure well be seeing these aircraft fly in large numbers in commercial service for several decades to come. A fine jet, and one of my favorites