Wells removes the pessimistic tone Chapter XI ended on by allowing the TT to travel again through time, and with ambiguous results. That he chooses not to return to the present says something about his change in attitude. Obviously, time travel is an exciting, seductive lifestyle, and continuing adventures would be difficult to pass up. But maybe the TT understands that he no longer belongs with the Victorian elite, and sees in them the beginnings of the lazy, effete Eloi. Perhaps he has even dedicated himself to preventing the class-divided dystopia he originally saw (and saving Weena, too).