I'd say DS 9's cultural impact was virtually nonexistent, consider that it is not in reruns at the moment, unlike TNG and VOY, which fill almost every hour on BBC America, suggesting, there's no perceived market for it, no significant thought given to it.
DISC's will be less, certainly given that it is sequestered in a ghetto, a viewer must consciously seek it out, pay for it and if they missed the debut on CBS, it is a blind buy one has to be motivated, to seek out, a sidebar,I was thinking about the absence of Babylon 5 from the new digital subchannels, like Comet, and, realized that no matter its perceived quality, the show had come and gone like a ripple in the sea, B5 fandom is a subset of a subset, DS9's cultural impact is only fractionally larger and only as a parasitic effect of its association with TNG. I think DISC is doomed to be by and large an afterthought, as long as it remains sequestered, it may well never reach a large enough audience to become a self-sustaining part of the public consciousness, (Barring some marked up tick in quality, and an accompanying word of mouth, pulling more eyes to it