In an excellent interview with IGN, Zelda producer Eiji Aonuma has explained why Nintendo doesn't follow the lead of other companies and remake vintage entries in the franchise:
Whenever we have to think about the remake, we have to also think about the background, especially what kind of situation, what kind of period and time that previous game was played in, because, be it Ocarina of Time or any other games, whenever they say they want to have a remake on whichever platform, they have some emotional attachment from playing that game at that particular time or environment. We cannot afford to destroy that kind of emotional attachment.
So there you go. Nintendo is protecting your precious memories!