manual intervention is the answer. It will happen, it is inevitable, and the sooner the better.
I think that GG said that for site where it was of an urgent matter - adult sites targetting potentially kids children - they would do it.
For any 'business-related' matter I don't see the need.
I cannot understand why one of the major search engines does not get into this now, before the others. Their results could be improved beyond measure quite quickly. Think what a selling point that would be.
How would you put that into place?
think about the sheer volume of pages they have in their DB and the time it would take
think about the volume of letters and complaint they would receive from unsatisfied webmaster - anyone heard of DMOZ - how many posts are there about a site taking ages to list - imagine having to manually check a whole website for its content and then giving it a value
as usual when there is human interaction there's is the 'checker' own perception of what's good and bad - what's good for one, might be worthelss to others
what rules would you tell them to follow to say what site is better than the other? why?
Honestly I don't think that having 'humans' check for the whole spectrum of website 'worthiness' is viable.