This quick change of heart from the Hawks is surprising. Atlanta just completed a deal that sent Kyle Korver to the Cavaliers, the first of what many around the league thought would be a series of moves from the Hawks who were likely looking to rebuild and get back to their core principles of player development.
However, six-straight wins, against Detroit, San Antonio, Orlando, New Orleans, and Dallas, has apparently convinced Atlanta, for the time being, that they're not ready for a rebuild quite yet. The Hawks are 8-2 in their last ten and currently occupy the Eastern Conference's fourth seed. Atlanta may have also never received an offer they liked or felt was a substantial return for Millsap over the course of this past week, but that's pure speculation at this point.
For now, it appears that Millsap is off the market, but a lot can change from now until the league's trade deadline in mid-February. It wouldn't be surprising if Atlanta reengages about a potential Millsap trade as the deadline inches closer.