How many people really enjoyed 13's franchise? How many people talk positively about it? How many people were exceptionally wary about 15 DUE to 13? Why did SE fall over itself to bring back the old FF crew and talk about how its different from the previous 3 installments?
Or are we going to do this song and dance about how the only thing that matters is sales numbers again. Its not like Cataclysm isn't seen as one of the worst expansions despite hitting the peak subscription wise, even though I personally liked it. I could insert plenty of games into Cataclysm's place, such as Mass Effect 3 or Skyward Sword, which also sold like mad but the majority of the community disliked -- and, most indicatively -- the company itself sought to distance themselves from after its launch.
Outside of Japan (And even then I think that's a meme that gets repeated with no actual proof), who actually liked the FF13 trilogy? The idea that FF13 didn't damage the FF brand is pretty silly.