Movie studios are reassessing their TV advertising. “Network TV has been part of Hollywood’s sales formula for many years, as studios desperate to launch expensive blockbusters blitzed the national airwaves in an effort to reach the broadest possible audience. But many studio executives now are calling that formula into question, having watched this summer as it failed to pay off amid a string of box-office laggards. The diminishing effectiveness of such ads is to some symptomatic of a broader problem in Hollywood.”