It is simple to make modest adjustments to entitlements and public spending, and to have a functioning and profitable capitalist financial system. If the right wants to lay its claim to power on its dedication to burning capitalism to the ground in order to save it, then it won't get power ever again and won't deserve any.
As a fact, however, the populist know-nothing set will be excluded from all serious decision making on any of it. They are too stupid and reckless to be let near practical responsibilities. If they energy and hysteria help put conservatives in power, fine, well and good. To actually listen to and act on their raving idiocies, however, would be as suicidal as the left has been over health care.
Go to the broad American people and tell them your platform is to shut down all the banks as evil and immoral and unsustainable. Promise them soup kitchens and poverty as far as the eye can see, and tell them it will be virtue. And you won't get to first base.
The problem is that this is not 17th century France and you are not Louus XIV.