May I ask what you base this feeling on? I noted that Peggy Noonan did not include Jeb Bush in her "deep bench" list. The ones she did include were either people who were too liberal to get nominated by the national GOP (McCain, Giuliani, and Pataki, for instance), or are relatively unknown nationally (Allen, Hagel, and Owens, particularly). It's going to take someone with national name recognition, and who has solid conservative credentials to assume the Republican nomination and beat Hillary, if indeed she's the nominee.
Why not Jeb?
He has publicly stated he won't run. Not even for Senate (which is a shame).
"Why not Jeb?"
There's also the appearance of a dynasty. That might turn off some voters.
With respect to Hillary, I'm just waiting to see her applying for a gun permit, taking a hunting trip, quoting the Scripture, attending Church with cameras in tow, and signing along to "Country Sunshine", "Country Roads", and "Coal Miner's Daughter."
And I will bet anybody that she won't be using Whoopi Goldberg for her fundraisers in 2008. At worst, she'll have to use the Dixie Chicks. And maybe she can coax Garth Brooks and Trisha Yearwood out of retirement (I hear that they are liberals.)