I cant comment first hand on single cmos / 3 ccd but some of the best cameras in the world use a siignle cmos - admiddetly this is super high end stuff like the kinetta and red.

kinetta: by filmmakers, for filmmakers ( is a mad one - check it out)
RED / Cameras ( even more mad - 4500 by 2500 sensor - HD sticker allowed -even by me- lols)

So perhaps a single cmos is ok?
And why do high end cameras have to look like something from toys-r-us that batman uses ( red ) or a prop from Brazil ( kinetta)