Before the mission ended, Cassini was already a powerful influence on future exploration. In revealing that Enceladus has essentially all the ingredients needed for life, the mission energized a pivot to the exploration of "ocean worlds" that has been sweeping planetary science over the past couple of decades.
Lessons learned during Cassini's mission are being applied in planning NASA's Europa Clipper mission, planned for launch in October 2024. Europa Clipper will make dozens of flybys of Jupiter's icy moon to determine whether there are places below the surface that could support life. The mission uses an orbital tour design derived from the way Cassini explored Saturn.
Farther out in the solar system, scientists have long had their eyes set on exploring Uranus and Neptune. So far, each of these worlds has been visited by only one brief spacecraft flyby (Voyager 2, in 1986 and 1989, respectively). Collectively, Uranus and Neptune are referred to as ice giant planets. A variety of potential mission concepts are discussed. Future missions to the ice giants might explore those worlds using an approach similar to Cassini's mission.