If Obamacare was repealed - What would happen?

http://www.motherjones.com/politics/2015/01/what-would-happen-if-gop-actually-repealed-obamacare

If the Supreme Court stopped subsidies from flowing to the 34 states that did not establish their own exchanges, 8.2 million fewer people would have coverage by 2016, according to research released this month by the Urban Institute, an economic and policy research outfit. Next year, the number of people insured through purchasing private plans would drop by 69 percent.
Without subsidies to purchase insurance, many people would immediately lose coverage because they could no longer afford it. Others could be kicked off their plans without Obamacare's protections for people with pre-existing conditions. "You would just have an awful lot of people be uninsured, and then that ripples back through the health care system," Jost says. "Basically, you would have a lot of people die because they couldn't get health care."

This is just the tip of the iceberg. A roll back of the Medicaid expansion would cause millions more Americans to lose their coverage and create mayhem for state governments. Without the ACA to plug the so-called "donut-hole" for prescription drugs, seniors would see their drug bills go up.
A Supreme Court decision against Obamacare would cost millions of Americans their coverage, but full repeal by Congress would be even more devastating. Health care experts describe a state of complete chaos were the ACA to simply disappear from the books.