This is more opinion than speculation.
WHY are there only 5 recipes in the game that use them? Anyone see anything relevant out there as to why they didn't release more recipes? You've always had "normal enchants" and then the "high end" versions.
Nexus Crystals were required for far more until they turned them into small prismatics.
Void Crystals were needed for several good recipes and then to craft everyone's Shadow resistance gear
Abyss Crystals had a whopping 14 enchants, and were required in a few crafts and for currency
Maelstroms were a currency and had 15 enchants and then you had pets.
Sha Crystals... 5 enchants. No other crafts. Not a currency to acquire other enchants.
In the current design, when they release catchup gear, Sha crystals will have a limited demand and almost nothing supporting a decent valuation of them since enchanters are completely capable of generating an endless supply - depending if the enchanters on your server actually perform the combination everyday. Should they release a method to retain epics from dungeons via drop (again, you know it's coming soon), you're looking at an absolute flood.
Certainly, many casual players are going with Windstorm or Elemental for their 463s and equate purple gear with purple matted enchants and are just waiting.
Is anyone else thinking about this?
At present, I have access to all these enchants and have since October, but I've noticed a steady decline in the value of the enchants with the exception of one day per week. Other days of the week this becomes high-investment-low-return and sometimes very, very close to investment. I'm fine investing 5000g to pull 5% ROI most days, especially on high gold cost items.
Anyone want to make a call on what direction we're going to go here? Will we see a high-end chest, glove, and back enchant? Maybe a better shield enchant? Right now the only dump for these are lucky drops for people, and only if they choose not to go with a competitive lesser enchant.
It would be my dream if they released new enchants behind dailies in future patches, which is what I think they will probably do. Otherwise the enchanting profession for high end enchants will diminish into obscurity when it comes to being decently profitable.