No one ever expected he would beat Leno on TBS. Or the Daily Show, for that matter. This isn't especially noteworthy
Sorry, but that's not entirely true
In its outreach to ad buyers, Turner guaranteed that Mr. O'Brien's ratings among audiences aged 18 to 49 would match those of Mr. Letterman and run about 15% below those of Mr. Leno, according to a person familiar with the company's offer to advertisers. Turner now believes Mr. O'Brien's 18-to-49 ratings could be just 10% below those of Mr. Leno, this person said.
Clearly, "the same ratings as The Colbert Report" is not what TBS was hoping for, and I'm sure they're paying Conan a lot more than Comedy Central pays Colbert.