I dare add a somewhat different dimension (or perspective)to this very interesting thread. I believe there is a very simple explanation for many chessplayers' desire to find new variants of this great game: as western society progresses, its members become bored increasingly quickly with the status quo, so to speak. Almost everything - from pastimes to products, from lingustic terms to media communication - needs to be rejuvinated more and more often in order to retain people's interest and/or patronage.
Just think, for example, of how many times - and how often - the "New and Improved" version of something is put out on the market. Westerns have less and less patience for just about everything. Trends in just about every sphere are replaced with increasing frequency; otherwise, people will cease engaging in them and die of boredom.
I'm rather surprised that many other pastimes, like ten-pin bowling, have seemingly been immune from all this. While I'm not saying that all this change is necessarily detrimental, for new possibilities always enrich the human mind and body, but I do think that we need to slow down a bit and further explore what we have already been gifted with before we decide to toss it into the junkyard.
Hah! I never noticed the starting position wasn't symetrical (king on left vs king on right). That's really funny. I mean in terms of the important files and pawn structure having it this way is a bit more orderly, I just never thought about it I guess.
Hmm. I would be a fool to say the theory/strategy of standard chess is completely known today, but I wonder exactly to what extent 960 would be able to change it. Certainly there would be unique and never-before-reached types of positions to analyse... but because the endgame truly is the same, I can't imagine middlegame theory being radically different.
Which is another interesting thought. With each move as a 960 game transitions from the opening to the endgame it becomes standard chess. The openings are radically different, the middlegames are different but the endgames are the same. If the starting position somehow effected the endgame too, perhaps something to do with the promotion squares, it would lead to truly unique and uncharted strategy.
Which goes back to my previous point. Chess 960 allows for a wider range of (opening and to an extent middlegame) ideas while standard chess affords a deeper understanding of those ideas.
I know I earlier took a jab by saying why not trying monopoly or candyland, but honestly for those that are hungry for a new challenge, a completely different game may not be such a bad idea -- after realizing endgames are the same 960 isn't looking as different as it did before. There are many complicated well known strategy games around, shogi and go are easy examples that also can give you a lifetime worth of study.