Here is a link that might interest some people.
No, this is not a port of Final Fantasy 7 for the DS, but it's a home brewer's developed RPG engine that can, coincidentally, read Final Fantasy 7 data files.
Now, if you put his work together with the music that I wrote for the IT format
here, you will notice that FF7DS is very doable, and faithful to it's original at that.
Now you're wondering about FMV right? No problem. Check the previous link, it's got a file format of DPG. DPG is a homebrewer's creation, it is a form of mpeg that's playable on the DS at a very respectible frame rate. FF7's original framerate was 15fps, more than enough for DPG to handle at full speed.
Now if any of you have the ability to run homebrewn DS software, run a program called "MoonShell". Run that DPG file in it. It is the intro to Final Fantasy 7...running in full speed, without any problems at all. Notice the file size. That video is 2 minutes long, and it is only 3.8 megabytes large.
Keeping in mind that most data files in FF7 actually repeat across all 3 discs, and keeping in mind that backgrounds/sprites/etc on the original Playstation version were VERY uncompressed, you can come to one undeniable conclusion: FF7DS is not only possible in it's entirety, but it's faithfulness would be almost astonishing.
Infact, I was confident in saying to someone else that, if done properly, the game itself wouldn't be more than say, 150 megabytes in total. Considering the press and attention FF7 would bring to the DS, Nintendo would more than likely cut Square Enix a deal with the DS Card prices. It would make them all much more money in the long run, anyway.
Now, the only problem is, finding a development group who'd be talented and dedicated enough to actually pull it off, properly.
If people are doubtful about the DS's 3D capabilities, read Ficedula's website (The first link in this post here
) He provides very good information regarding character model poly counts and such.
EDIT: On FF8 and 9: It's possible but a lot less likely than FF7. There were significant advances in all the technology used in these games, meaning much larger assets would need to be compressed. It's unlikely 8 or 9 would ever see the light of day on the DS. FF7 has the best chance, in my opinion.