"It's not just the end of our show, it's the end of 'The Late Show' on CBS. I'm not being replaced. This is all just going away," Stephen Colbert told viewers last July , as he announced that the long-running program would be canceled at the end of his contract. The final episode of the network's late-night talk show airs on May 21. According to CBS, the cancellation was "purely a financial decision." Even though Colbert recognizes that the economic collapse of traditional broadcast TV models may have contributed to the decision, "there are many people who believe there was another reason," the talk show host noted in a recent interview with The Hollywood Reporter.…