Yawns
First off, Katie is a real news person. OK, she isn't a booming voice-of-god. Ted Baxter was that. Katie will never go back to mornings. After awhile, she may go trotting off to spend 30 years on 60 Minutes, just like Morley/Mike/Ed/Dan/Lesley. When she's in her 70s, maybe she will host a daytime chatfest a la Barbara Walters, but the days of 3AM wakeups and gigglefests with wacky weathermen are over.
Also, the Katie News format is pretty much the same it was under Gunga Dan and Interim Bob. Katie tried something new. It failed. The consumers of restless-leg-syndrome-meds, denture adhesives, and room-air-fresheners all rebelled, sampled the other broadcasts, and ratings tanked (sort of). Actually I think NBC News is down more percentage-wise -- is Brian Williams headed for Today? Hardly.
Now the 22 minutes are pretty standard, save the wasteful 5 minutes given each week to "viewer voting" with Steve Hartmann. She even cut down the just-plain-awful appearances of Dr John LaKook to one every couple weeks rather than night after night after night.
Besides, the CBS Early Show will eventually fade away or just become a cut-in news service. Nearly every TV market in the US would rather have those two hours to add more local hours of local ken-and-barbie reading newswire, voicing over previously broadcast network stories, cooking with a local restauranteur, or hyping some big local event that the station is sponsoring.