Sorry! I seem to have overlooked this thread. Here's the more-or-less "official" response from someone with a Staff Member tag.
For reseeds, I don't think any of us actually have stuff actively lying around anywhere to reseed with. I might have them, but I know I lost a good chunk of DATS-related files due to a harddrive failure from many years ago. I pretty sure I had to make do with whatever I could find of DQ myself.
As for the rest of the series, DATS is no longer actively subbing anything. Pretty much the remaining core staff have real life obligations that prevent them from doing any fansub work on a frequent basis. So, while we haven't necessarily dropped the remaining projects, there will be very little, if any, progress on them. We simply do not have the time to dedicate to fansubbing anymore.
We do indeed have most of Zero's raw translations still, from what I can see. However, as @Zeromaru
mentioned, they will need an experienced translator to check through them, and right now, none of our translators really have the time to dedicate to that task. If you have the resources to complete the remaining work and release to the general public, I can definitely inquire about sharing. @DQA
was also working on DQ at one point, but I don't know if he's still interested and could help.
Anyway, this is probably not the most satisfactory answer, but this is the best I could do with what I know right now.