LOS ANGELES — Even though Rupert Murdoch’s $76 billion bid for rival media giant Time Warner Inc. has been rejected, that doesn’t mean how you watch TV shows and movies will stop changing any time soon. The cash-and-stock bid by Murdoch’s Twenty-First Century Fox Inc. was partly meant to counter consolidation among TV distributors like Comcast-Time Warner Cable and AT&T-DirecTV. The more must-have channels such as HBO and Fox News Channel are assembled under one company, the stronger that …