If you want this option on your tickets, I strongly recommend purchasing, upgrading, or modifying as it looks like it will be departing very soon with no replacement.
Personal opinion: Reading into it further, this may be the slow build up towards the closure of DisneyQuest and/or ground work towards implementing the seasonal pricing on multi day tickets. It could also signal a complete restructuring of the 12 year old Magic Your Way scheme since the focus is now not so much on additional days, but additional days being spent outside of Magic Kingdom as much as possible.
Personal opinion: Reading into it further, this may be the slow build up towards the closure of DisneyQuest and/or ground work towards implementing the seasonal pricing on multi day tickets. It could also signal a complete restructuring of the 12 year old Magic Your Way scheme since the focus is now not so much on additional days, but additional days being spent outside of Magic Kingdom as much as possible.