Robert Lamm say that Chicago could go on without any founding members.
http://ultimateclassicrock.com/chicago- ... l-members/Perhaps the can go the route of the Glenn Miller Orchestra. Miller's plane disappeared during WWII.
From Wikipedia: "After the disappearance of Glenn Miller in 1944, the band was reconstituted under the direction of Tex Beneke, its lead tenor saxophonist, singer, and one of Miller's longtime close friends. A few years later, the Miller estate, having parted ways with Beneke, hired Ray McKinley, principal drummer in Miller's Army Air Force band, to organize a new "ghost band" in 1956.
Hollywood contributed to the band's popularity and that of its founder and original members with the 1953 release of The Glenn Miller Story on the big screen. The band garnered award nominations and box office success, as well as top hit status for its soundtrack album in 1954.
The Glenn Miller Orchestra has recorded and performed under various leaders, from 1956 to this day. Singer Nick Hilscher became the director of the touring band in 2012, replacing previous director Gary Tole."