Why do we need to fill the void? If Obamacare goes away then so do the regulations and the controls it imposed. And once it is repealed then no alternate solution should be imposed.
If the goal is for everyone to have healthcare then that isn’t going to be done without a one-payer solution, and in the long run that would be disastrous. Any toe-dipping into a government solution, any program designed to kind of/sort of cover everyone is only going to make the situation worse. Ted Cruz has the right idea - repeal, period. Any other solution is no solution at all.
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The regulation of healthcare before obamacare was monsterous. Mandates on what each state considered minimum in policies, price fixing, elimination of competition by the blues in many states... I could go on and on.
Would be nice to see a competitive marketplace with many options for levels of insurance needs. This would also start dropping the fixed and abnormally high costs of medical care and procedures.
Regulations are only one of the reasons why selling across state lines won't work. The major reason is how the insurance companies do business.