There will undoubtedly be another red in the mix...red is a popular color and they are likely just refreshing to a different shade. The other two are colors that while attractive to some percentage of folks, they are not loved by the masses. I suspect they will be replaced by other colors that have similar properties...appeal to a certain percentage of buyers, but different than the current ones. The Winter Chill color I have is like that...not a huge seller, but appealed to enough folks to make it worthwhile for a couple of years.
I personally would like them to offer a more "aggressive" color or two for JGC like they do for Wrangler, etc. Like the orange that was on the teaser "Trailhawk II" concept, etc.
2012 JGC Summit Hemi
2016 Subaru Outback Limited
2011 Subaru Outback Limited