XVI is inevitable. Despite people's gripes with XV, the game has been financially sound for Squenix despite all the problems it had with the older fans but that's been the same since even the game's heyday. Recent interviews in the last year have also been confirming my hunch that vXIII was never in any real development until the execs turned it to a numbered entry and handed it to Tabata, so honestly the turn around time for XV's development is not as bad as fans think it is, roughly four to five years as opposed to the ten most fans think it had. As it stands, the game has sold around seven million copies within two years. So honestly, despite fans wailing on it, and I understand this sentiment cause we all know I did the same with XIII, I can't fathom how SE would not see this game as a success.

I think the only reason why no one at SE is talking XVI yet is because the company is bogged down with too many high profile titles as it is. I feel once KHIII is released and SE has a better idea of the time table for the VIIR titles come out, will we see info about XVI. Then again, SE is having a special event for E3, I wouldn't be surprised if they end it with a reveal of XVI being worked on. Probably nothing but a logo to show for it and the revelation that Motomu Toriyama's team is working on it, but I can totally see SE announcing it.