Nope. It doesn't really fit with the themes of Kingdom Hearts, and the main characters are still kind of teenagers. They have more to worry about than getting married at this point, anyway.
Unless we are talking about the marriage between Ansem and the Seagull Whose Egg Sora Stole, which is obviously going to happen. Maybe that could give Ansem a change of heart as he saves the Seagull from its path of vengeance and destruction. It could be a sort of story angle where they save each other, and work together with Sora and the gang to right their wrongs and rid the worlds of all darkness.
Actually, guys, I think I've discovered the game's ending. Should spoiler tag this because it's so realistic.
