After This American Life parts with longtime distributor Public Radio International July 1, it could become public radio’s most widely carried show without a major distributor representing it. That’s if the show pursues that option. Program host and creator Ira Glass has hinted in interviews with the New York Times and Chicago media reporter Robert Feder that he’s considering self-distribution. But there may be good reasons that few shows have gone that route. Self-distribution poses challenges that few resource-strapped program creators are willing to take on, including handling their own billing, marketing and station relations.