If Dish starts transitioning SD channels to 8PSK/MPEG-2, they can swap out older DVRs for 942s of course without allowing folks to subscribe to HD via satellite with their new 942s. This is in order to not have to swap out folks later with MPEG-4 for HD. If I were Dish, I trash the 921s. It's not worth the hassle of subscribers having problems with them.