without getting into the whole PR debate I think the biggest reason is they have to support it and its become a bit of a albatross round their necks. Also its the biggest metric for paid links, which is of course something they have recently come out as being anti.
Saves me rewriting it, that was my answer to one of the comments left of the article who asked why would they.
But I nor any one else said they would simply that a Google employees have been asking what would you replace it with, the article by the way is not really about PR its just the bit everyone :roll: (David) picked up on.