Time reviews the animated candidates for The Little Gold Man.
... This category is a remnant of the 1930s and ’40s, when “an evening at the movies” meant just that: a three-hour-plus banquet of two features, a newsreel and a few cartoons that were often the best things on the program. Except for Pixar, which grooms its prospective feature-film directors by letting them start small, Hollywood studios don’t support cartoon-shorts departments any more. ...
Henry Luce's magazine has a little of the above wrong. Walt Disney Animation Studios also grooms directors by doing shorts. And Warner Bros. Animation has produced a string of new theatrical shorts over the past couple of years.
So at least two of the majors are still in the short subject game.