I would very MUCH like to see RenderMan compatibility on the AmigaV! Why in fact I know of one fellow who is developing a truly RenderMan-compatible modeller and renderer for the Amiga right now!
Whether PIXAR develops something itself or not, RenderMan will appear for the Amiga anyway, due to it's flexibility and expandability as a "3D graphics language". Couple it with ARexx and think of the possibilities :)
I cast a vote in favour of PIXAR (or anyone) embracing the RenderMan standard for 3D graphics. If you would like to know more about "Excalibur", the OTHER Amiga RenderMan-compatible modeller/renderer, let me know, and I will let the author know you are interested.