I suspect Sony simply lost the rights to Dogma. When Disney dumped it, the Weinsteins personally bought it from Disney/Miramax, then sold the distribution rights to Lionsgate. Lionsgate didn't have a video arm at the time, so Sony got the video rights. My guess is that Sony's rights has expired and Lionsgate now has the video rights too -- Lionsgate's name is all over the Sony DVD/Blu releases, so Sony was probably releasing it under a license. Of course, it's a fair question whether a hypothetical Lionsgate Blu would be better than Sony's.