Ultimate Coils represents a very interesting thing within the community.
On the one hand, you have a lot of the really good raiders that are going after the prize of the weapons (which look quite amazing). On the other hand, you have players (like me) that have not fully cleared Omega Savage, and probably don't are probably not in a raiding static that see the shiny and want it - yet (for one reason or another) don't have the time (or the drive) to form up and work with a static to get into Ultimate Coils.
Really though, this needs to be the prize that is extremely hard to do, and will continue to eat people alive for years to come. These cosmetics not only need to stay rare, but they need to be representative of an achievement for at least this expansion, if not the next and possibly the one after that.
Ultimate Coils needs to be the hardest thing in the game, and it needs to be there for the raiding community so they have something to work towards. And it should NEVER change.