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Letterman's late-night slot is next likely opening — who should fill it?

Want to host “The Tonight Show”? Take a number, and be prepared to wait in line 20 years.If all goes according to plan, say comedy insiders, Jimmy Fallon will remain at the helm of the 49-year-old NBC institution for at least the next two decades. And Seth Meyers, who makes his “Late Night” debut Feb. 24, is another “Saturday Night Live” alum destined for a lengthy tenure in the after-
Image: David Letterman
NEW YORK, NY - JANUARY 31: David Letterman attends \"Howard Stern's Birthday Bash\" presented by SiriusXM, produced by Howard Stern Productions at Hammerstein Ballroom on January 31, 2014 in New York City. (Photo by Kevin Mazur/Getty Images for SiriusXM)Kevin Mazur / Getty Images file
David Letterman.Kevin Mazur / Today

Want to host “The Tonight Show”? Take a number, and be prepared to wait in line 20 years.

If all goes according to plan, say comedy insiders, Jimmy Fallon will remain at the helm of the 49-year-old NBC institution for at least the next two decades. And Seth Meyers, who makes his “Late Night” debut Feb. 24, is another “Saturday Night Live” alum destined for a lengthy tenure in the after-midnight slot.   

So now that Fallon and Meyers have ascended to the only available thrones, who’s on deck for the next changing of the guard — especially if it's a seat vacated by David Letterman?

Read the complete story at NBCNews.com.