The hated the title as well, but the movie did project a potential future... without Spock. Students eventually taking over the Enterprise some day, Saavik being introduced as some sort of successor. Kirk's son and lady may have a future on the ship; by the end it present it. I didn't like the title for the sixth film either but oh well.
I'm sure this is in a book somewhere about the making of Star Trek, but people have to remember that sci-fi on TV was not seen as a serious genre back then, suitable only for kids. Making references to classic literature could have been dog whistles to the snobs in the audience to tell them that the people making the show were not just doing Captain Video.
According to this site, it's authentic: http://trekcore.com/blog/2015/09/early-star-trek-feature-film-artwork-that-didnt-make-it/