Talking Films Here to Stay, Man Asserts! How right he was.

Cohn jumped ship, it seems - headed over to Christie FIlm,a a production company that handed Arbuckle and Lloyd in their early days. By the late 20s, they were doing moves aimed at Black audiences, so Cohn might have gone from writing for blackface to the actual thing.
The company didn’t survive the early years of the Depression. As for Cohn, he got out of the movie racket entirely - and was appointed the Police Commissioner of LA. Really.