The first round of sales data for the TNG blu rays has been posted in the Season 1 thread on the TNG board. To put it mildly, those sets are doing exceedingly well. In less than a week they made almost 6 million USD in sales. They achieved this in the face of a serious issue with the audio quality, which promted a disc replacement program and a suspension of sales. One also needs to keep in mind that the first season of TNG is one of the least popular of the franchise.
The first season of TNG cost 9 million USD to remaster.
This means they will break even after just a few weeks of sales. If these numbers hold up DS9 is almost certainly guaranteed. So Voyager's chances are looking pretty good to me right now.