I would love it, I feel like KH2 was leading up to that!!! The whole fricking game was based on relationships, with every world ending in a tender moment between the main couple of the world, and Sora of course missing Kairi, discussing his feelings for her or even (my favorite scene ^_^) imagining dancing with her and talking about wanting to be with her. I feel like after all that build up and hinting it would be fitting.
However, we all know Nomura's style and I'm concerned he won't feel it's necessary because in truth it's not. The game is more heavily based on friendship than love, even if there is some hinting towards romance. But let's all keep our fingers crossed!(: