To say the the entirety of console gaming rests with a single game is ridiculous hyperbole and nothing more.
Tabata was referring to consoles still being a viable platform in Japan in the future. He's not wrong saying that XV is potentially one deciding factor of all that.
IIRC wasn't FF7 praised as one of the things that made the PSX as popular as it was?
Normally I'd agree it's strange and bizarre to think of a game with such esteem and possibly being "system seller" just for the one game.... But c'mon, who are we kidding? I haven't seen one FF15 news article or topics that doesn't get a TON of commentary following it (even though, delay after delay, it doesn't deserve it). Maybe not a system seller; but I do think the hype machine works in mysterious ways.
I commented on this in my Theatrhythm review, but I think FF is absolutely still part of the conversation. People ALWAYS talk about it. They're a BFD, whether people hate it or not. Let's be honest-- we ALL want to love FFXV and say "HURRAY WE LOVE FINAL FANTASY AGAIN." No, it's not going to sell CoD numbers, but NOTHING sells CoD numbers. I would be unsurprised to hear in a year or two that people pick up a PS4/Bone to get Type-0 and FFXV (provided the latter is as good as I'm sure everyone is secretly hoping).