‘Taylor Swift: The Eras Tour’ will be a blockbuster — and might shake up the movie business

Greg Marcus has been in the movie business for years but he never expected to be urging moviegoers to take out their phones during a film — let alone to be crafting friendship bracelets in preparation for an opening weekend. Movie theaters are readying for an onslaught like they’ve never seen before, beginning Friday when “Taylor Swift: The Eras Tour” debuts. The concert film, compiled from several Swift shows at Southern California’s SoFi Stadium, is expected to launch with $100 million, or possibly more.