have you ever seen the super-wide rearview mirrors that are sectioned to provide a panoramic side-rear-side view?
you could also put a mirror inside the car at the corner of the window.
This has been mentioned before on this site as an alternative to side mirrors, except with just having a really big rear view mirror. I have never used one to know what it's like, but certainly and interesting concept.
Just an interesting note, the crx hf (cheap and good mpgs) did no come with a passenger side mirror for some years/markets. I dunno if it was to save money or to lower cds.
it used to be that right side mirrors were uncommon on all cars, but i'm sure that's also been said before. as for the crx xf, who can say for sure. the metro xfi was also mirrorless on the right side.
the most interesting tidbit i came across in the insight mirror thread (unrelated to mirrors) was the guy (with side-view cameras) who also uses a wind generator to top up the insight's batteries at night...