Will Nightline Be Conan's Undoing?

It may be no direct fault of his own.. except that he can't grow an audience... but could the success of 'Nightlie' be the undoing of Conan O'brien?
Take a look at the latest numbers from TVNewser.com
CBS' "Late Show with David Letterman" remained in first place last week as ABC's "Nightline" came in a close second. NBC's "Tonight Show" was in third by a gap of 1.42M viewers. This makes 17 weeks that "Nightline" has had more Total Viewers than Conan O'Brien's program (four weeks for the A25-54 demo).
The competition in the A18-49 has gotten very tight with all three programs tied in the rating (1.0)

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