(FILES) TV host Jimmy Kimmel speaks onstage during the 96th Annual Academy Awards at the Dolby Theatre in Hollywood, California, on March 10, 2024. America's late night talk shows once were appointment viewing, but with ratings tanking and ad revenues plummeting, their coveted place on the small screen is in question. The hosts of yesterday and today -- comedians from Johnny Carson and Jay Leno to Jimmy Fallon and Jon Stewart -- are household names, and their jokes were once mandatory conversation starters at the water cooler. (Photo by Patrick T. Fallon / AFP) (Photo by PATRICK T. FALLON/AFP via Getty Images)