The talk about SkS/SpS and GCD is another can of worms they need to deal with - materia sucks and it should maybe just be deleted at this point. Give classes passive traits or active buffs that set their GCD to a specific point and design from there. Even from a sweaty parsebrain standpoint, the amount of actual control and influence a "custom" GCD gives you over your DPS is so minuscule that it's hard to take it seriously. Especially when just playing "good" will still net you a high purple result on most classes, which is more than enough to clear savage and ultimate. It would also allow them to be a bit more free with class design - if you have a comparatively rapid GCD like MNK, you don't really feel a need for lots of oGCDs to make the rotation feel less bland and boring. WoW spent multiple iterations fiddling with the idea of letting players adjust or customize their gear through one system or another, and they all got removed because they were unnecessarily complicated and didn't really present any kind of meaningful player choice, since it was literally just (relatively) simple math to determine which stat to focus on and which stat to dump.

And as much as I hate it, I think Rithy255 is probably close to how the rework will look. Goring Blade becomes the effective replacement for FoF, being a near-passive damage boost that's pretty much always active as long as the player has a pulse like WAR or DRK, Atonement removed or otherwise sidelined (I still favor a "it's basically Raiden Thrust" solution, myself), skills with absurd potency boosted even more to compensate for the damage deficits caused by removal of FoF, and so on. Square-Enix has been especially prone to giving classes PRESS FOR BIG NUMBERS buttons on 30 or 60 sec cooldowns ever since EW came about, and we can probably expect those buttons to turn into automatic crits down the road because that design (big damage numbers designed to fit neatly into raid buffs) results in substantial parse differences when they *don't* crit, since they become such a large amount of your total DPS for the fight. That also ties back into my "materia is bad and needs to be removed" comment above, too.