I've never been a fan of games based around preexisting stories. If you're allready familiar with the story then there is little to no surprise, and I end up complaining that they did it wrong. We allready know the basic story, how much of what they do will really be all that surprising? Discovering during the story that Summoners didn't survive the battle with Sin was a surprise (not a terribly big one considering no mention is ever made of them in the present tense but a surprise none the less.) But knowing that Zanarkand is ultimately destroyed, knowing that Yevon bastard spawns Sin, and knowing numerous other tidbits would kill my enjoyment of any sort of prequel. What I'd rather see is a full Blitzball game in of itself, with the option of either playing the FFX version or the X-2 version.