If XV comes out and it isn't a 9/10 game people will say the franchise is dead, that the game is such a disappointed that derailed the S-E legacy and that it's one of the worst mainline entries. If XV turns out to be an actual masterpiece people will discredit it because a) it took to long, b) yeah but the main characters are one direction copies, c) nomura didn't direct it and tabata is the spawn of the evil, d) they need to go back to turn based system.
There's no middle ground. People's criticism toward this franchise amazes me. I understand being catious about the game after the last two mainline entries launched being a massive disappointment and Tabata's last game not being that well received (even though everyone was praising it as the real XIII and saviour of the franchise just by looking at a few trailers when it didn't leave Japan), but there's a huge hyperbole going around XV. I'm afraid the game won't be judged by its own merits when it finally releases.