But surely having Spock in it would be more of a stigma than not? Spock is associated by the general Star Trek hating public as a nerd icon. Somebody that nerds like. The type of people who make "hilarious" jokes about people living in their mother's basement (NEVER GETS OLD!) would be turned off by a movie with Kirk and Spock in a way they wouldn't have been with new characters and no Vulcans on the bridge. It's fun to speculate.