The main aspect for it to be JRPG is exactly the aesthetic and the storytelling, not the turnbased gameplay (they have been moving away from it since FF X) and being open world is in the game since at least FF IX (first I played).

J-rock and J-pop is rock and pop but song in Japanese, that is the only difference from them to american or european bands... but why wouldn't they make the same success than the others? Same could be said about K-pop.

Yes, it's because of thematic (language would be a no issue when we consider that Most countries doesn't have english as native language and that german bands had success even without singing in english), so I sustain that the origin of the material is still quite important when foreshadowing the success.

Sorry about the late response, but here it is.

But you do know that FFXV gets more linear in the 2nd half as noted by Square Enix. Also, you need to do more than just asserting that FFXV has more in common with Fallout 4 than with past FF titles because the Proof by Assertion fallacy can be easily broken down. You merely listed a bunch of vague points without further elaborating on them, similar to how you claim that your prediction is based on data of other games, but not bother to show the actual data. Perhaps you should spend less time making baffling statements like your "PS4 spirit" moniker and form more sound points. It would also behoove you to directly address some of my other points, as well.

One fundamental problem to your argument is its implication of the notion that because one game shares certain qualities with another, it therefore shares most or all qualities. I'm not saying you were arguing that, but it definitely gave off that angle. Saying that FFXV and Fallout 4 are both action RPGs is not a solid argument because "action" is a vague term. Games can be actiony in different ways. FFXV has a more Kingdom Hearts-esque gameplay (& KH is also a JRPG) whereas Fallout 4 adopts a lot of FPS aspects. Same thing applies to "open-world" and Western themes. Again, that's vague and you never elaborated on these things.

Photorealistic ambiance and character design is where you really fell off the rails. There is definitely some photorealistic aspects to FFXV, but it also retains the Japanese aesthetic that you see in past FF games, anime, and manga. The hair and faces are a clear sign of this. The main cast gives off that J-pop boy band vibe, something that western RPGs do not offer. Non-linear storyline, I already went over that.

Overall, FFXV is a JRPG not because of the nationality of the developers, but it still utlizes aspects that JRPGs tend to use (e.g. character design, J-pop boy band tone, some linearity, etc.). And if you don't believe me, then well.... Conan O'Brien and Elijah Wood just made a recent video on FFXV. Based on their reception, FFXV is likely not a game that will appeal to the average western gamer.

i have never in my life since the release of xb1 in 2013 heard any xbox fan to say that he's hyped for FFXV, also if Quantum Break a xb1 heavely marketed game floped, Recore floped, Rise Of The Tomb Raider also a Western mainstream Square Enix game struggled and games like Gears of War 4, Forza Horizon 3 sold under 1m in their first week, this shows it all, i think that FFXV will easily do 2.5m+ on ps4 week 1 and xb1 won't do more than 5% of that, FFXV fans have waited a long time to play this game, and they sure as hell won't play the most inferior 720p version with fps drops on the xb1, they waited a long time to play it and they will play the best version, and that is ps4/ps4 pro also you can look ath the VG Preorders, 

No, FFXV is a JRPG. The only thing "western" (and not even RPG-specific because there are more non-RPGs doing it than WRPGs) about is the design option to litter areas with modern chore-like pick ups. And...honestly even that isn't western, koreans were already doing it long before, it's just that the west adapted it to a more approachable design of quicker satisfaction and less grind. The combat is jrpg, the story and characters are jrpg, the music is jrpg, everything is jrpg