I wouldn't want to see DS9's effects remastered the way TOS was- the change in what it looks like when ships fire and go to warp.
But the quality of DS9 is going downhill. As mentioned, it was made on videotape- and they don't make things like they used to. The quality of aired episodes is going down fast, at least the episodes aired lately- terrible.
I'd be all for them digitizing it, and cleaning it up. And since most people have flat screens, maybe tweaking it a little, as mentioned, maybe replacing a bit of stock footage for something different.
As long as they only made it a bit clearer, and didn't go nuts like with TOS, I'd be all for them doing a touch of remastering. It's tolerable to watch now, but it won't be forever. There's a lot of artifacts lately on the episodes I've seen, so they're going to have to do something, especially with the better TVs out now.
And I can't imagine buying DS9 on DVD at the prices asked for that quality...
I mean, why for something that's TV quality?