User blog comment:Thailog/Ep. 206 "Bloodlines" discussion/@comment-5145408-20120604165540/@comment-432124-20120606193641

I think that a lot of you are forgetting that both Nathaniel and Bart knew that saving Barry and curing Neutron wasn't the only thing that Bart needed to do in order to prevent his dystopian future. Bart was clearly planning to stay in the present to do other stuff after saving Barry. I'm pretty sure that the reason why Nathaniel expected everything to change was because he was thinking about all that other stuff and he had expected all of it to make a big difference. And I don't think that Bart would be that selfish as to just want to save Barry's life and not do all of that other stuff. Remember that Bart knew that the machine would be a one-way ticket and he didn't care about not going back to his era. I'm pretty sure that Bart also expected everything that he was going to do to make a big difference. The reason why it didn't was probably because he thought that the sequence of events that caused the dystopian future had started with Barry's death, but it had actually started earlier than that. Therefore, the things that Bart didn't know about caused the events that occurred after his arrival to eventually spiral out of his control and so he wasn't able to "crash the mode" completely.