3. Walter Dies From Cancer
It would be quite the fitting conclusion to see Walter meet his end due to cancer. His cancer was the very thing that started all of this and to see it be the very thing that ends his existence would bring the show full circle. Last we checked Walter seems to be winning the fight against cancer but there is always a solid chance it could become a major health concern for him once again. Bringing our attention back to the flash forward from the first episode of season 5 we can see that after making his big purchase in the restroom Walter pulls out a bottle of pills and then goes on to take some medication. Given his storied history with cancer it would be pretty safe to assume that cancer itself could be the reason for him taking this medication. Everything seems to come full circle in Breaking Bad. Walter has managed to get by with alot of luck as far as surviving in the world of meth trafficking. He has outsmarted many people throughout his journey and there's no doubting this man is extremely resourceful and harbors within his brain true genius. Walter can think his way out of pretty much any situation. With that being said to see him fall to something he has almost no control over would be a very fitting end for our dear Heisenberg.