CBS has said we won't. TNG Blu-Ray sales were disappointing, compared to the cost of the remaster. And they have syndication revenues from the TNG:R to make up for it. DS9 has never been nearly as successful as TNG in rerun syndication. Markets are not clamoring for an HD DS9. I don't like it either, but them's the facts.
Also, it would cost more to remaster it than TNG, because after a certain point they stopped using physical models, so there isn't physical film to rescan for recompositing effects. The CG would have to be redone from scratch.