What ever floats your boat, thats your opinion and you are entitled to it.
However I personally dislike (very much so) this idea, Koji is a genius who has written some of the greatest music (weather MIDI, or Orchestated) that has every been seen in the gaming industry. I'd like to keep it that way.
Zelda is ment to be an epic tale each time and its goal is to retain its own identity with each release, a great soundtrack helps them reach this goal. When I hear an amazing orchestrated piece of music I sometimes think "Hey that sounds like Zelda!", or when I am talking about games and someone asks me how the soundtrack is I always compare it to Zelda, how many other games can you really do that with?
A brilliant orchestrated (although sometimes MIDI, it is ment to have a similar feel) or classical piece of music brings out emotion on a level that can never be mached by a Rock/Pop band.