Well you can either keep up (false?) hopes or do the maths and see where the planets are located (pretty easy) and are there any potential gravity assists (not

Well you can either keep up (false?) hopes or do the maths and see where the planets are located (pretty easy) and are there any potential gravity assists (not as easy, but there are software packages that help). If you just want to eyeball the situation, take a look at Celestia. I think orbital insertion is out of question for the outer planets using conventional space craft propulsion because the difference between high radial velocity required to reach the planet and the low tangential velocity of the planet itself is greater than the spacecraft's delta-v budget. But there won't be another Voyager mission in our lifetimes, a suitable arrangement of planets happens only once in 400 years or so.