"This hammer has broken Daemons on my anvil, Elf.
A related but larger-scale lingering question for me is whether or not the merging of the worlds was the endgame for Causality and the behind-the-scenes manipulations that led to the big world-wide change
Wouldn't that render IOE obsolete?
The first question is how would a beherit work right now, since the God Hand in its entirety has been brought into the world with the advent of Fantasia? Where would the ceremony take place? Second, like you said, are new apostles even needed, and if so, are beherits the preferred method? One could imagine an industrial pseudo-apostle factory in Falconia where "volunteers" would receive "holy power" to better fight for the Falcon. I think we'll probably get those answers eventually, we just need to be patient.
So like a direct " bestowement " without the need of strong emotions and sacrifice? That's a cool idea.