I see your point, and perhaps there's someone we don't know right now.
I'm just thinking that the sooner we groom someone for 2008 the better off we are.
Point taken, however.
FWIW....my take is that there are two possible scenarios.. One is that Bush/Cheney decide on a hands/off policy for 2008..that is they do NOT meddle in the primaries, or, the other is that after the 2006 elections..especisally if the GOP gains a few more seats in the Senate, then Cheney could retire..allow Bush to name his VP..it'd then be a fairly easy confirmation...and that person would have a leg up for 2008..