Well said Doctor Mog, Xatsh.
What's so sad is that keeping the original Open World NMs (Dodore, Great Buffalo, Haughtpox, etc.) content and even Faction NM content "relevant" *isn't* that time consuming.
We all realize most of the Dev Team is busy making 2.0 and trying to make some new content for us currently (1.21, 1.22, etc.), but all it takes is 1 member of the Combat Team that's astute enough to look at the stats of current high level gear, and...
* Adjust numerical values of currently existing NM / FNM Drops (probably in a spreadsheet).
That's it.
Of course they have to think about Balance and making sure it won't overpower anything or outshine anything too much, but by adjusting some numbers of existing assets (like Aeolian Scimitar, Mosshorn, Champion's Lance, Harlequin, Templar, Buccaneer's Sets), they could actually keep this content relevant and alive for old and new players alike to partake in.
Faction Credits are rarely used nowadays, and the original Open World NMs are pretty much ignored / forgotten.
Having 1 Designer go in and adjust numbers (or as Vatsh is saying allow old drops to be used in 1 new recipe or 2) isn't going to derail development for 2.0.
Even with slight #'s adjustments, or allowing Materia Melding on U/U Drops, it would make their work on Dzemael Darkhold relevant again and a place for players to go back to and revisit. Right now, all that work (as recent as Patch 1.18 (Dzemael)) has been invalidated except by people wanting to get an Achievement.
If they took the time to create just 1 New "Item / Reward System" (e.g., like the partial Open World, partial Instanced SKY from XI - a system of getting Trigger NMs, Items from NMs, Items from Bosses, Craftable Drops that make something even better, etc.), it would go a long way to keeping these Patches relevant until 2.0.
And the new "Item / Reward System" could still be relevant in 2.0 (e.g., they could move whatever Trigger NMs, Bosses into the new World Redesign and keep the Items as well).
It's certainly better than our current pattern of "New Patch = 1 Primal Fight with standalone, Themed Weapons, in a basic Arena."