It  would be irresponsible to ditch suggested energy efficiency requirements.  Production builders will certainly resist implementation of anything that slows a project or costs a penny, they tend to be strictly bottom line driven since many answer to stockholders ..... do not listen to them.  Look forward as visionary leaders and implement all facets of future codes to give new homeowners a place they can afford as our energy costs rise.  I have been involved in remediation projects where real savings of 70% have been realized at great costs to homeowners, the homes were not that old, just poorly built.