You are being quite short sighted in your analysis. First, I doubt most consider Bush too conservative. His disapproval rating is due to many things including failing the nation on conservative issues. Many are upset with his big spending habits, his failure to enforce the border, and his failure to support Israel. His problems in the Iraq War are noted by conservatives and liberals. So, Bush’s problems are not due to his conservative positions.
Second, if the nation elects a Dem and it is a disaster, who will the country turn to? It will be to my 20% party that supported true conservative principles. If you elect a liberal disguised as a conservative and it is a disaster, you have destroyed the GOP and have placed the Dems in power for years. Think through the 1976 election and maybe you will understand.
I see, so your clever plan is to elect democrats and hope they are a disaster. For that matter, since whenever dems govern it is necessarily a disaster, and whenever republicans who aren't conservative enough for you govern it is also necessarily a disaster, you are simply guaranteed a disaster unless your favorite guys are in office. And after each disaster, the electorate always sees this and goes right to your guys. Now I understand why conservatives have won every (or every other) election since Jefferson, it is so clear.
But anyone interested in winning this one has to go elsewhere. You've nothing to offer them, but smugness about ensuing national disaster.