The Maelstrom market is a bit ridiculous atm, so I hope the ZA/ZG gear will be disenchantable (into maelstroms).
I don't raid, and I don't think upgrading my enchants to the top-of-the-line 10k a piece maelstrom versions will have a very significant impact on my DPS. (>5%) At the same time I think it's a bit weird that enchants that are only slightly better are more than 10 times as expensive.
PS: What's funny about this thread is that the ZG/ZA epics are basically blues anyway, since unlike previously in wow, the color has no impact on the quality of the item in cata. Hell, they could make the ZA/ZG 'epics' green and they would still have the same stats.