That bankruptcy is not a magic free moment - it simply means someone else pays. Depending on the case, this might be the state through medicare/medicaid, it might be the health care provider, or it might be third party creditors.
Eventually, though, those defaults are all factored into operating costs of hospitals, the government, banks and so on - meaning you and I pay for them.
So, in the old system, we were all forced to pay for health coverage, whether we liked it or not. In the new system, we're all forced to pay for health coverage, whether we like it or not. ACA is explicit and, with extreme certainty, cheaper, since it expands preventative care on a systemic level.
But, of course, since people didn't realize they were paying for it previously, they now throw fits because the cost is made explicit.