To replace it with “the free market” would mean ending and eliminating the health insurance market as it is currently set up.
Yep, we need a "hard reset" with the health insurance system going back to 50's/60's era traditional group health insurance...get the government out...no govt. mandates on what coverage you have to purchase i.e. restore true high deductible policies like a $5K or $7.5K deductible policy for catastrophic accidents/illnesses. That is what the wife and I had before the "ACA"/Obamacare and it was affordable (<$300./mo)(now banned under the ACA as "inadequate coverage"). Also get the government out of the health care coverage/reimbursement industry, their "20 cents on the dollar" reimbursement rates for Medicaid/Medicare caused hospital and doctor prices to skyrocket (to compensate).
Unfortunately none of this will happen...the "Free Stuff Army" is too strong along with the politician vote buying power schemes/hand outs.
More likely the ACA will achieve it's goal of completing the transition to single-payer socialized medicine (we are 1/2 way there...the Feds/states are paying over 50% of health care/insurance costs already).