I wouldn't assume TNG on Blu-ray made a profit, or that it got anywhere near close.
The word from people close to those involved in the TNG remaster is that Paramount and CBS have been pleased with the sales from the TNG blu-rays. However the plan was never to make a profit purely from the blu-rays alone, the decision to spend the money and upgrade TNG to HD was largely done to give the show continued life in syndication. TOS and TNG continue to be heavily rerun all over the world, and with HD now the standard it will give the shows continued profits from syndication deals for years to come.
That would seem to indicate DS9 will not be remastered. How often has it been shown in syndication? I can only remember once years ago on the Sci-Fi Channel. If I am (hopefully) wrong on this please chime in...