Stephen Colbert 's brutal axing at CBS has fellow late-night hosts Jimmy Kimmel , Seth Meyers and Jimmy Fallon quaking in their boots that they're next on the chopping block, RadarOnline.com can reveal.

Sources said the talk trio has good reason to be worried as viewership declines, advertising revenue shifts, production costs soar, and left-wing political jokes clash with the Washington dealmaking challenges faced by parent companies. Article continues below advertisement

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"It's a dying genre and ratings have been falling for many years," revealed an insider. "It's an open discussion in that world about who's going to go next – if any of them survive at all."

According to the

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