Fly quite often between DFW and Boston, and for the last 2 years, have never had a problem. My wife sometimes flies with me, and being only Gold, has missed the chance to upgrade just once in approx. 15 times. I always have AC AAngels work on her upgrade.
With the segments now as an option to earn EP, more are coming out of Dallas because of the "commuter run" of DFW/AUS.