I'm concerned about the size of the games and the consistency of a high quality design. 358/2 may be a graphical marvel for the DS it also cuts a lot of corner and many of the Worlds you go to come off as low grade versions of their counterparts and others seem completely empty until Boss battles.
Its possible to pull it off with V and VI but I have a feeling an exact port might be more troublesome and SE would redesign places in a format similar to their Playstation brethren, even then I feel the quality while horribly impressive for the DS might not be up to par for fans. Redesigning certain story sequences as cutscenes (even just using in game models) will also cause a few issues especially since VI is a bit more story heavy than 358/2.