User blog comment:Giganta/Character Flaws/@comment-4821105-20120703083646/@comment-432124-20120707202543

Quotes from "Bloodlines": Neutron: Curing me and saving Flash's life, you know, it's only the beginning. Bart: I know, Nathaniel. Big mission. Lots to do. Better get to it.

In other words, Bobbobin, Bart and Neutron (that's the fire guy's name) knew that saving Flash's life alone wouldn't save the future. Bart was planning to do more than just that while in the present. But from what we saw at the end, Bart clearly didn't succeed in some of his other objectives (possibly due to lack of information) and that was more likely why the future didn't change much.