In a way, movies today would be pretty much more artistic-focused than mindless blockbusters, don't you think? Movies would be focused on violence or plot twists to get an audience. Special Effects would not be an industry of its own. Also, if SW wasn't a hit, there would be Star Trek Phase 2 on TV in the late 70s... Probably no Star Trek movies until recently, as part of the "old series becoming movies" hype.