Here's my opinion: It COULD work, BUT it would involve not being able to interact with the other save file. Another drawback would be something like the GTS, you deposit a Pokemon, It get deposited by the GAME not by file, so you have to share GTS data with the other game. FINALLY, it ruins one of the best aspects of the game: Interacting with others. In a world with 2 or more save files, there's no need for a second or third game. We'd just have say, Black. That's the Fifth Gen. Why make White version if you can have two people playing on the same Black cartridge? That's at least how I interpret it.