Avik makes an excellent point regarding repealing the individual mandate while leaving the rest of PPACA intact:

According to the Washington Post, John Boehner “has proposed repealing provisions of Obama’s health care law, including the requirement that all individuals purchase health insurance after 2014.”
While the individual mandate is one of the very worst features of Obamacare, repealing it while leaving the rest of the law intact would be disastrous. …
[I]t would totally destabilize the private insurance market. The Obamacare individual mandate is relatively weak, as mandates go; but repealing it, while maintaining the law’s requirements that insurers take all comers regardless of age or health, will drive insurers out of business, in what economists call the “adverse selection death spiral.”

This is a mistake.