Obamacare consist of 2000 pages of spending and taxing in addition to over 10,000 pages of rule and regulation, anyone who thinks just tweaking it will solve the problems in Obamacare is crazy. The bases of Obamacare is the central government has direct or indirect control over the nation's health insurance, that is the holy grail that the Democrats have salivated over for decades. 
In my opinion repealing Obamacare and starting over again is the only way this issue can be addressed and resolved.