Juno has been given several mission extensions, the last (and most exciting) of which involves close passes to three of the Galilean satellites, also allowing them to trim its orbit every time, and approach closer to ever higher latitudes of the Jovian atmosphere, until it is intentionally crashed in 2025.
It is my understanding (correct me if I'm wrong) that if nothing is done, Juno's orbit will keep drifting, then have a perijove directly over the north pole, and then come out to the other side, and allow a new set of close passes over Io, Europa, and Ganymede, that alone would be excellent news for science. If I recall correctly, the failure on the main valve and the decision to keep it on a longer orbit, means that most of the propellant is still there. It was not vented.
Some engineers believe it may even be possible to go into orbit around Titan. "Aerobraking”, or using a body's atmosphere to slow a spacecraft down, has been tested with other spacecraft and is planned for at least one JPL’s mission in the future. Aerobraking and/or spacecraft maneuvers could be sufficient to place Cassini in orbit around Titan, allowing the spacecraft to study Titan very closely over a long period of time.
Now, I know Titan has a huge atmosphere, and none of the Galileans do. Setting aside the likehood that such decision is taken: Does Juno have enough propellant to attempt orbital insertion around a Galilean moon?