There was actually a rumor going around from a french newspaper source that there was actually a movie in the making based around tidus's history. I'm not sure if its credible though. It might be false. I don't know any details

If they did make a movie, i would watch it without a doubt. Who wouldn't ?. I hope it would be about yuna and tidus and there life after ffx-2. I love them to death and think they are an adorable couple.