I dont think its by a thread to be honest.
I do think its skating on thin ice because if they repeat vol 5 they are going to lose it. So Vol 6 is their make it or break it point.
As for Revival its actually not as hard as you think it is. They just need to stay balanced by it. And what I mean by that is they cant rewrite every death ones like Pyrrha that are so clearly special sure that makes sense but ones like Huntsmen in vol 4? Not so much
Bravely Default and its sequal Second actually use probably around a dozen revival tropes and they pull them off well.
Deus Ex Machina. Literally the player is reviving and animating Tiz keeping him alive. This comes into play in the second were they use a soul like us to revive Tiz then later using time travel the collected hopes and dreams of the travels to revive Tiz for good.
Time Travel as mentioned before. In Default you kill the enemies that is made clear but they are alive and well for the most part in second how did they survive? Simple while saving Tiz the adventurer also saved them as well.
There is also time travel to reset and gain a second chance.
Multiple dimensions with parallel worlds letting familiar events and people play out again.
Then there is Kikyo playing dead for a trap
Qada faking dead to escape
Barbossa as a ghost
Vega and Altiar as souls still in this world.
There is probably more that I am forgetting to be honest Bravely LOVES messing with tropes and the fourth wall and it pulls it off well.
So its not as hard as people think it is.