Games with a more worked morality system would only benefit the game itself, games like The Witcher and Dragon Age: Origins (despite the relation meter in each companion) are replayed because of the "What if i didn't helped the townguard, what would have happened?" Giving a different story and outcome, instead of the two paths endings(good or evil). Different ending stories, diferent gameplay paths due to the morality choices made,indeed, if well explored would benefit the games and... us gamers :).The next step would be the companies in doing it.