Say you're happy now,  “Once More with Feeling" subtext foreshadowing

Today it is ten years today since the first airing in the US of "Welcome to the Hellmouth" and I take the opportunity to write about one of the most important episodes of Buffy the Vampire Slayer, the classic "Once More with Feeling".  I must confess I am still a newbie to the series, less than one year.   My only advantage is really having watched all the episodes in a very short span of time and in such disorder that guaranteed me an unusual perspective on the story.

After a couple of repetitions my conclusion is the next:  The wonderful subtext in OMWF is giving away beforehand, the important developments of Season 7 and maybe beyond.     But let me expose the reasons and flesh out this thought.