I'm sure most of us will agree that Terra's story will see some closure in KH3. Having him exist primarily as Xehanort's pawn for most of the series, we want to see him finally overcome the old man. It'll arguably be the story's biggest example of redemption, so I'd like to see it done right. Think about it: Terra's a complicated character made up of concern, grief, vulnerability, anger, and darkness, lots of darkness potential. This is the Terra that we have to be familiar with throughout KH3, otherwise his victory will feel empty by the time it comes. So, how do you insert a character that's been arguably comatose for the whole series into its final chapter? Give her a keyblade
I think it's best if they took the Return of the Jedi route. More specifically, develop his character through his relationship with Riku. It's important to remember that Riku never would have been a Keyblade Master (or wielder, for that matter), had it not been for Terra's own potential to be one; it's not just Keyblade Masters that can initiate the ceremony, but also people with the potential to be one, and that has to count for something on Terra's end. For Riku to play a huge role in Terra's redemption would bring Terra's story to a full circle.
In Greek mythology, Prometheus helped mankind discover fire, the symbol of potential manifested into power. For that, he was imprisoned, waiting in darkness. In time, Heracles eventually emerged from mankind, and went back to save Prometheus. In KH, Prometheus is Terra, mankind and Heracles is Riku, and fire is the keyblade; they all come together in a full circle.
I think it's best if they took the Return of the Jedi route. More specifically, develop his character through his relationship with Riku. It's important to remember that Riku never would have been a Keyblade Master (or wielder, for that matter), had it not been for Terra's own potential to be one; it's not just Keyblade Masters that can initiate the ceremony, but also people with the potential to be one, and that has to count for something on Terra's end. For Riku to play a huge role in Terra's redemption would bring Terra's story to a full circle.
In Greek mythology, Prometheus helped mankind discover fire, the symbol of potential manifested into power. For that, he was imprisoned, waiting in darkness. In time, Heracles eventually emerged from mankind, and went back to save Prometheus. In KH, Prometheus is Terra, mankind and Heracles is Riku, and fire is the keyblade; they all come together in a full circle.