Nobody who's given any serious thought to the explosive expansion of the federal government and looked at the root causes can really believe that the substantial effects doctrine and the New Deal Commerce Clause are something we need to keep.
Until social conservatives understand this, the democratic party (not that they don' support the WOD and abuse of the commerce clause either) will seem like a refuge to those who would support fiscal conservatism, but see none in the social conservatives and run screaming from these other agendae.
There's something we definitely agree on, and it goes to other areas too. I think it should be restated. Personal social conservatism is a value that promotes overall fiscal conservatism. The problem comes when you try to force that social conservatism onto others, because the enforcement incurs a serious fiscal cost.