I don't expect DS9 or any of the other series to get the Blu-Ray remastering treatment (though I guess Enterprise doesn't need it since it was filmed in HD) because from what I've heard, the sales for the TNG remastering aren't great, and even though DS9 is a great series (my personal favorite Trek), it doesn't have the legendary status of TNG.
If the poor sales figures for TNG blu-ray are correct, then that means the general public wasn't interested in it. Based on poor sales figures the general public doesn't care about TNG, but DS9 is the more popular series among Star Trek fans. So it is possible DS9 would actually sell better than TNG. I personally don't think it would be enough to convince the suits to remaster DS9, unless remastering can be done cheaper.
Now if my supposition that DS9 will sell as well as TNG is correct, then the question becomes how much can be spent on a remastering project and still be profitable?
I'm currently watching Farscape on blu-ray, and even though it didn't get a proper HD remaster it is a slight improvement over the DVDs in terms of picture quality. Of course it had the advantage of existing in the higher resolution PAL format but even so there could be a slight improvement if DS9 was given the same treatment.
The main reason I double-dipped on the Farscape Blu-rays was because of the special features. If loads of new specials features were added to a non-HD remastered DS9 blu-ray I would buy it.