You're implying that insurance companies will allow prices to fall and lower their profits. That seems like a really unlikely event in the current economy. They fire a lot of doctors and nurses, but they won't lower prices.
The ACA requires 80-85% of health insurance to go toward medical care (medical loss ratio). The way they work around that is to figure out how to charge more for medical care.
This is assuming no competition materializes from the lowered friction