As a former programming apprentice (I programmed some little games some years ago), I believe it is not hard to implement, but it would be too heavy for mobile. English is not my native tongue, so lets try to say it in other words: it would make phone's processor work a lot more, causing excessive heat and batery drain.
David can correct me if I am wrong, but it would not be a good idea from the perspective of leting the game be as much playable as possible (of course, it could be something that the player could just turn on/off, but not a key feature for story/quest purposes).
And the more developers spend time on visual, the less they would have to dedicate to a good story, the main power of RPGs... Let alone in this case, where we are talking about a one-man work.