Seems like the airframe limitations of swing wing aircraft make the designs hard to modify and make existing aircraft require more maintainence. The F-111 was a

Seems like the airframe limitations of swing wing aircraft make the designs hard to modify and make existing aircraft require more maintainence. The F-111 was also retired relatively early and the Indian Air Force retired its Mig-23 and Mig-27 aircraft before its Mig-21s. Aside from the one exception of the Su-24, seems like only the big swing wing bombers are kept in service worldwide.