So this is an attempt to add more interest and variety to gear while adding a reason to hunt/acquire specific gear pieces (through all content including crafting) for reasons other than glamour. I propose adding an enchantment type system without the need for a new profession, by amending the materia system we already have.
Currently the materia system we have now is used to allow flexibility to stat allocation on crafted gear, and it works well in that regard. However, and of course this is just opinion, I think it would be interesting to see stats like: "increased movement speed", "5% chance your next WS or Spell will have reduced TP/MP consumption", or "on successful parry/block your next auto-attack is a guaranteed crit". You could even go so far as creating materia that allow a shield to proc or reflect damage.
These types of stats could be placed on rare dungeon drops, S-rank hunt drops, HQ crafted gear, and raid drops. They should be generic enough to not be job specific, useful but not OP, and on gear that is semi-difficult to obtain. You can obviously just equip the gear and get the bonus, or upon getting 100 SB you can Convert the gear and have "a chance" to get that bonus attribute in "enchanted materia" form. This new materia would be untradeable, and require no profession to meld (think Nexus). Most gear will need to have a specific meld slot added only for "enchanted materia" that will limit it to one per item.
Enchanted materia can also be limited by equip slot; for example: you can only put run speed on shoes, only put parry/block materia on gloves, and WS/Spell related materia on your weapon. This system is not about, being OP, one more thing to grind, and definitely not about gear swapping. It's about having a reason to continue doing existing content and looking forward to new content, because new tome = new gear = a few more stats is already growing old.
Similar systems have been proposed and this for those that played WoW this might sound like nothing new, but if varies in a couple keys ways and I look forward to hearing the communities opinions on it. Negative or otherwise.