Daggerfall isn't hard to remake, I already have a GL engine coming along nicely that can read in almost all of the data in Arch3D.bsa and display it in an untextured format. The format of the BSA files for Daggerfall is mostly known, and another forum member here is working on discovering the rest with me, and we have already figured out one huge thing that could help figure out several others. The hardest thing I imagine, would be figuring out how many points each bonus or weakness would have to adjust the slider on the character creation menu. That kind of stuff would be difficult, but the rest is not so hard.
Displaying the stuff isn't what I figured would be hard. It's something we've been able to do for a long time. I've just never seen anyone get past that point. I don't think even Interkarma managed to really accomplish anything beyond making the models and sprites show up in his project, and he worked on it for a pretty long time. But that's sort of besides the point. What I've been trying to say isn't that it would be impossibly hard, just that it'd be difficult enough that making a fresh new game would just be a more viable option. Well, that and that actually making the engine work out right using all of Daggerfall's original assets would be pretty hard. The graphics are always the easiest part to getting working in that kind of project, but everything else... well, even Exult doesn't really do a perfect job of emulating the original (I don't know if they've fixed it, but the last time I used it was later last year and even then they didn't have NPC schedules working properly).
iThe thing is, it just wouldn't sell on some kiddie-platform where most of the kids today can't play anything unless it runs in 2048x1536 and has high-resolution 3D models. Sound stupid? Guess again! I love it when some kid playing WoW says he can't play Doom because of the resolution. It'd be the same thing with DF on a DS. They'd have to overhaul the resolution of the sprites and textures to make it viable, and since we're making an engine from scratch, why not just make a whole new game?
Um... wait, what? They'd have to overhaul the sprites and textures for the DS? Have you SEEN the DS?