Agreed, but not now. It isn't necessary now and DS9's effects are the best among the ST series anyway. They will probably not need to change them dramatically, but getting rid of reused footage and adding some ships here and there would sure be sweet.
Of course it will happen when HD is a necessity, but that can wait.
We have seen how CBS has handled the TOSR project and I don't want that to happen to DS9, where ALOT more FX have to be handled.
As for my wishlist:
- The final battle (which is mostly reused from "sacrifice of Angels" and "Tears of the Prophets")
- The Odo FX, which were top notch at its time, could need some tweaking