Well, it's been rumoured they might consider DS9 blu-rays based on how the TNG blu-rays sell. And though the TNG BR are selling well, historically DS9 doesn't do as well as TNG. It got lower ratings, a recentally released soundtrack CD release flopped and IDW's DS9 comic did so poorly they gave up their DS9 license. DS9 season 1 might get a blu-ray release, but if history is any guide it won't sell that well and CBS might not bother with the rest of the series and definitely won't touch Voyager. Hell, I doubt Enterprise will sell that well, the only commercially viable Trek is TOS, TNG, and the Abramsverse.