I'd like to see a arranger keyboard that would automatically "dumb down" to the intelligence level of it's owner. Also, the quality of the voices would automatically reflect the quality of the playing. Also, hitting a "bad" chord while playing live, would cause an immediate system shutdown and restart (with the autoload of a 10 Gig piano sample). Also, each time a SMF or MP3 is played through the keyboard, a vocal sample would automatically play the following announcement: "THE MUSIC YOU HEAR IS NOT BEING PERFORMED BY THE PERSON PRETENDING TO PLAY THIS KEYBOARD".
"Faith means not wanting to know what is true." [Nietzsche]