Very long distance spaceflight like this is still basically only power d by gravity slingshot maneuvers where we steal an infinitesimal amount of inertia from p

Very long distance spaceflight like this is still basically only power d by gravity slingshot maneuvers where we steal an infinitesimal amount of inertia from planets to give a spacecraft some velocity. Voyager was launched during pretty favorable gravitational assist conditions, so unless we dramatically improve delta v and isp in the spacecraft or get a better configuration, probably not.