This Jonkers infographic, "Working Titles of Famous Novels," is an interesting study of what might have been. Would 1984 have been as popular as it has been if it retained its working title of The Last Man in Europe? I kind of doubt it. That said, some of the working titles are better: I've always preferred Atlas Shrugged's working title because it better reflects Ayn Rand's on-the-nose aesthetics. A quick internet search reveals that people have been wondering after working title what-might-have-beens for years. (Wacking Off might be a better, more appropriate title for the Philip Roth novel than Portnoy's Complaint.)