Hollywood decamps for Park City this week, braving snow drifts and thin air in a quest to find the next indie breakouts, Oscar contenders and buzzy horror hits. Yes, Sundance has returned in all its mountain-side glory, and with it comes the expectation that with enough tenacity and some big checks, studios and streamers will land the next “Little Miss Sunshine,” “Brooklyn,” “Manchester by the Sea” or “The Big Sick” (to rattle off just a few of the festival films that have sparked all-night bidding wars). Of course, not every heated battle for the next big Sundance-bred hit leads to...