Seems to me it is a bit too early to be making that claim.
History is certainly on my side when it comes to the candidates currently sitting in the House minority.
And Newt is only going to run if there is vast dissatisfaction with the main contenders.
Is Romney to Giuliani's right? Nobody knows. McCain is a flake and has never been the darling of social conservatives (or conservatives in general) at all.
I know there's a sizeable (or at least vocal) minority here who think Duncan Hunter is a legitimate contender. I don't think so, but it's theoretically possible.
I've always advocated voting for your favorite in the primary, regardless of how likely he or she is to win. That's how parties get shaped.