Cassini is now about in half of his way to the Saturn. But bicouse every jurney has it's end. This one too have to be finished in nearest future.
Robert Mitchell sayd thet this mision shud be over until 1. july 2010. But main problem is to clean out leftovers of this flaying robot. Bicouse polution of the outer space coud not be aloved.
Bicouse it has two RTGs, very powerful elctric engine it canot colapse to any ice surface. Explosion of this two motors coud make a wother and evry bactery thet survayvd trip from the earth coud be "reanimated".
Main option is to make this satelite go out of Saturn's system and then out of solar system. But this reqirs very much and precies calculations.