Does anyone know why this is likely to be such a long way off?

I always thought that when the current "automatic updating" system was put in place, that the next step for the very next version, would be for "real automatic updating". But that time has not yet come.

I guess I just don't get what the technical challenge is. The current automatic update system seems to work flawlessly from what I've seen, and when it breaks, it seems to just fail instead of causing a catastrophic failure. So I'd have thought the step to a fully automatic system would have been trivial.