Earlier quoted context omitted.
From the perspective of a person who uses an alphabetical language, such as English, sure Unicode can be "done". But if your language is based on ideograms, like Chinese, then it'll never be "done". As words are created they need to be encoded.
Again, that's great and I understand that (I've studied Japanese), but that's only part of the new version. They're not adding pictures of "mousetrap" and "olives" and "toilet plunger" because any existing language needs to write these. Furthermore, I'm really starting to question the way CJK is encoded. We don't make every English word a separate codepoint. 97% of these CJK ideographs are just different combinations…
Even the "C" has traditional and simplified variant.
Fortunately I think Unicode is pretty much done for Alphabetical languages. Someday if CJK design Unicode isn't good enough breaking it off to something better isn't entire impossible.