As absurd as this idea might sound, I actually love it.
I don't necessarily know if it would work for FFXV, seeing as I've yet to play the game, but I definitely would like to play a video game opera. Hire an actual opera composer, librettist, and singers, have the music adapt to the events in the game (something akin to the narration in Bastion), and design the game specifically in such a way that, for example, battles could sensibly play out with songs as well (arias, duets, and ensembles), and I'd be in for it day one. A $60 entry fee is significantly less than actual tickets to a show.