Allright, chalk up one success!
I'd actually feel better about carbon to carbon transitions than carbon to aluminum. If the fork is made beefy and the methods of attaching parts are made sensible, a carbon fork could be great. The problem is finding what you need.
For instance. Some bows use parts that attach directly to them like quivers and sights. While these parts largely attach through threaded insert, in many cases they use velcro compression straps. Another example would be the carbon booms on sail boats, they dispensed with the metal hardware for attatching the load take-offs, and went to spectra webbing. It should be easy to find methods of attaching stuff like racks to composite forks if anyone was seriously interested, in redesigning the product. But in a world where the 5mm steel inserts fail, it's hard to get excited about Al anything.