See you can say what you want about Final Fantasy XV, but it really was 13 franchise that did the damage to the brand, 13 was not well receieved in Japan compared to rest, it was actually the first place to give warning signs of the game (A lot of people were in denial at first, and just downright blamed Xbox360 for the changes, it was really fun times). 13 itself did fine (subjective), because of the brand, but it has just about as many 5s on amazon as it did 1s, and that is what damaged the brand. It is the same reason a lot of people I know have zero faith in Square now a days.

 I think ultamitely they have to rebuild that relationship with the fanbase in that region of the world. If Final Fantasy XV is great not just good or passable (which it sadly is about 50/50 chance, since all of the warning signs are there; long development time, changing of teams, questionable cast direction), Final Fantasy XVI might actual have the first increase in the franchise. 

This again....

People said that FFXII was bad as well, how come FFXIII managed to sell well after XII? And XII itself also did well, after people said X-2 sucked.

This is about Japan, so you do know XIII did sell worse compared to XII right, continuing the decline. If you truly believe the trilogy did no damage to the brand more power to you, but where I am standing I can see it. 

yeah but FFXII didn't had anything to do with the decline. The decline was because of the handheld dominance.

I can agree with that, I also don't believe FFXII had a longing impact (positive or negative) that the trilogy had, but I was not going to write complex response, vs my response to you earlier.

So I went with the simple of saying it did not sell better. 

Also, as i said some days ago, FF declining in Japan is nothing new. People made a fuss when FFXIII declined compared to FFXII but nobody mentioned that FFIX had a huge decline compared to FFVIII (for different reasons though). That's why, if FFXV fails to perform good in Japan (1+million) doesn't mean the end of the franchise in Japan.

The franchise was born in that way, different characters, different worlds, stories, enviroments, ability systems, but keeping the "core gameplay", that is (was) the philosophy of Final Fantasy.

The franchise was born in that way, different characters, different worlds, stories, enviroments, ability systems, but keeping the "core gameplay", that is (was) the philosophy of Final Fantasy.

I disagree, ever since it moved past 5 it was changed. Change isn't bad, it isn't always good either.