Don Quixote should be preserved as it is one of the classic works of the world.  For the time it was "out of the box" writing that did not build this character up to be any "real" hero but at the same time he was.  Other than the comical values it posesses it also can show future generations the value of operating out of the norm.  Do you know how much was actually taken out of the book due to the church's regulation of it, I am curious to know how much he really had to cut to publish the story?