I had predicted CBS News would try a co-host to help Couric out. I just thought it would be a month or so earlier.
CBS has too many $$$ invested in her at this point.
The cardinal sin in business and poker is throwing good money after bad. Future decisions cannot erase past mistakes. Successful businesses are forward looking and CBS was very successful for a number of years. Of course, CBS is just a Viacom brand these days, there is no "CBS" corporate entity any more.
If this happens, watch for a cooking segment on the evening news---it's what Katie does best ;-)