For anyone else looking for a bit of insight into the ending of the series, I found this over on the official Daedalic forums. It's from the writer of the games, Poki:
"Wow!
I am extremely impressed by this discussion. I've been reading some postings, that issued and discussed the exact same questions I've been pondering about for the past years.
They say, the author should be silent so his work can speak for him. Nevertheless, here are some of my thoughts, you can see for yourself how they fit into the big puzzle that is Deponia:
They say, you lose your ideals when you grow older. We all are on this planet only for a limited time, so it's just realistic to settle your goals with what's achieveable. The ability to learn from experience, which plans will fail and which ones will be succesful, is called reason. So it's reason that makes you settle down with your ideals. But we admire "courageous" people, who keep their goals, even if they've become highly unrealistic.
Rufus is such a person - in perfection. He wants to achieve the impossible, symbolised by Elysium. But the closer he gets to Elysium, the clearer it gets, that there will always be another goal for him: Elysium, Utopia... and then?
Rufus can't settle down peacefully without becoming something he hates. He could have had "A life of peace and satisfaction" in Kuvaq already, had he been willing to clean up a little bit and be satisfied with his life. But that's not the kind of guy he is.
In the end, the central conflict of the game are the two conflicts, that are discussed here - to reach the end or just keep on going forever?
You can imagine how hard it is to find a fitting end for this conflict. It seems impossible. But I'm too much Rufus myself in this regard... ;)
P.S.: It gets even more interesting when you consider that this whole conflict isn't even Rufus' conflict essentially. Rufus already chose Chaos before the game even started and is very unmoveable in this regard throughout the whole trilogy. It's actually Goal, who brings the conflict to the game and carries it for most of the time. She's the one who's indecisive - and the rotor-situation isn't a metaphore for her indecisiveness by accident."
You can read and join in the whole discussion here:
http://forum.daedalic.de/viewtopic.php?f=169&t=4319