I'm going to make a bold prediction. I highly expect many pieces of discarded food to be thrown my way shortly. This prediction is mostly based entirely on personal belief and more of a "social" experiment for square-enix to help them determine where kingdom hearts 3 should rightfully go to.
My prediction is
Before Kingdom hearts 3 begins production, they will port Kingdom Hearts: Final Mix, and Kingdom Hearts 2: Final Mix to the Wii, in all regions. Why I believe this? Well, simple really. If they manage to sell these two games (Espically in the japan region, where both games have been out for QUITE awhile). Then the wii is a viable market for kingdom hearts 3, and chances of a success on the wii is higher. If it fails however, kingdom hearts 3 will likely stay PS3 exclusive.
Thats my prediction, call me on it. Dare ya, theres no facts or evidence that says I'm wrong, or your right. We're all SPECULATING.