Sandboxes are inherently a purposeless pursuit of 'what is interesting to me' and can only be pushed forward by incredibly driven players and this, on it's own, already signals that the GM is kaka because he can't find a way to drive the players himself and relies on them to drive themselves - essentially, you're expecting a character [b]and[/b] their player to give [b]themselves[/b] purpose and ideally give [b]others[/b] purpose. Given the standard of writing prevalent on ALL roleplay websites and the fact that succesful roleplays all have at least one thing in common (a driven plot, or at the very least story arcs that aren't sandbox) leads me to belief that sandboxes are, in fact, kaka, and kill roleplays simply because they can only succeed when a player is driven. 

And, in the end, when that one driven player is left, it's not a roleplay but a monologue.

And at that point one may argue, [i]SO IT'S THEORETICALLY POSSIBLE IF ALL PLAYERS ARE DRIVEN????? TOUCHÉ ODIN[/i] to which I say yes, but you're living in a fantasy world where communism might succeed because theoretically [i]it might[/i] and nazi's were sweet kind boys because theoretically [i]they could be,[/i] but I'd kindly invite you to come back to reality and face the symphony of truth.