It would be a sad end, but one etched into our minds. So lets say orochimaru does indeed take sasukes body, the result being this extremely powerful being. The new orochimaru fights, and cleanly defeats the AL (who is more powerful than the others, in most aspects). Itachi flee's, seeing the extreme power of this. They release the power of the bijuu whatchamacallits on this new guy (or perhaps, the AL does as his ultimate attack) and he just "copies" them, making him that much more powerful. So then Orochimaru goes to kanoha to seal the deal. Itachi, being the last surviving member of Akatsuki tracks him, hoping to find away to destroy this beast. It the final showdown it is Naruto vs Orochimaru in Sasukes body. After seeing what Sasuke has done etc etc Naruto flips out, releasing 9 tails power in himself , but somehow able to control it (hence, Narutos true power is in himself rather than the Kyuubi). An epic battle takes place, and about 75% through Itachi join in against Orochimaru, seeing he may be able to defeat it as it is occuppied with Naruto, not for Kanohas sake, but this may be the only chance he has to stop this thing (because it's bound to come after him next). Due to Narutos "aura of change/friendship" and Itachi being there, the sasuke of Orochimaru gains some of his sanity back, seeing what he has become. After seeing what he is doing, he has an inner fight with Orochimaru, and in the end kills himself, thus killing Orochimaru and "saving the world". The world is sad, Naruto becomes hokage, and Itachi, touched by Sasukes ordeal dissapears forever. Hmmm. Sounds like darth vader. btw, I don't think this will ever actually happen, but it was a cool thought.