I tend to agree with this line of thinking. The icons are becoming solidly ideogrammatic. They express the idea and are no longer literal — similar to Chinese characters or Kanji. For example, east 東, which is the character for sun 日, in the branches of a tree 木. The character is literally an image the sun rising, but it represents the idea of cardinal direction. The icon for floppy disk no longer represents the act of writing to a floppy, but it does represent the idea of saving.