Tom:
First, I wish to state that while I love the place, in my opinion, Augusta National has been slightly overrated for as long asratings have been published, before, during, and after the various changes that have been made. I have to cheat to squeeze it into my personal to 10.
No rater worth his/her salt will rate a course without seeing it in person. ANGC is a course that most raters see in person only occasionally, if ever. Therefore, I doubt if many have seen the course since the most recent changes and most won't see it again before their next ballots are due. Therefore, I expect to see very little change in its ranking in the short-term. Who knows about the long term. Until I see the course next April, I am resisting making any judgement. Even then, I expect to find very little change from the member's tees, which to me is more important than the championship tees.
No matter what happens to the ANGC ranking, you can be sure that rankings will continure to be discussed on GCA and will stimulate discussions of architecture.
David:
Pinehurst #2 did drop way down in the rankings back in the early 80's because of a misguided attempt by the owners to modernize the course. It regained its top 10 ranking only after new owners restored it pretty much to its earlier state.
It is still unerrated!