That after 3 Final Fantasy's, the next would be on a next gen console.

Here's what I mean: I, II, and III were on the NES. IV, V, and VI were on the SNES. VII, VIII, and IX were on the PS1. And finally, X, XI, and XII were on the PS2. So, what I'm thinking is, by the time XV rolls around, there would be a new Final Fantasy on a next gen console. I don't know if it's true or not, just something I noticed.