I believe that the anchor is gone, because it formed on the spot where the orb made connection to inquisitor's hand. It was connected to her/him and from there it gained power I think. So when Solas turned the inquisitor's hand in to stone so she/he could cut it off, the anchor ceased to function, that was obvious when Solas turned the inquisitor's hand to stone, I saw the surprise and relief on my lavellan's face, I might be imagining it, but Bioware has done a great job on facial expressions and voice acting, therefore, in my opinion, the moment Solas cast his spell on the arm, the inquisitor realized that the anchor has stopped spreading, after all she/he told the advisers that they didn't have much time, so they knew what was happening to them and how the the anchor's condition was like.
But I for one am glad that the anchor is gone even though it costed my lavellan's forearm. I was so mortified to think of the possibility of her dying, I literally didn't want to go on with the DLC XD