Personally, I'd prefer it if they made FFV in a style other than in the style that FF3 and FF4 were made in. I don't feel like the FF3 and FF4 remakes really improved the original games by making them 3D. You still viewed the character from a top-down view, so how you perceived the areas didn't really change. FFV has a particularly large amount of areas where your view of the character is obstructed by the environment, but based on what you can see, you can guess where it is that you're supposed to walk. I'm not sure if this would work quite as well with the FF3-FF4 DS style. FFV also has many areas that involve implied depth. Because of this, I think it would be better for the remake of FFV's style to be based around one of the higher numbered FF games.
(SPOILER)My personal dream is to see it FFXII style, but that's not happening. 