Obamacare is only alive because of government subsidies to the insurance companies. https://www.upi.com/Top_News/US/2017/07/29/Trump-threatens-to-halt-Obamacare-insurance-subsidies/7031501354649/
Trump just has to make an executive order to stop it. He should also end Congress´s exemption to obamacare. If congress was subject to oc as the people were, they would end it asap.