So what will the insurance landscape look like if congress or the supremes do away with ocare?
The free market will take care of it.
Gee maybe the insurance companies can go back to assessing risk based on actual facts and grandpas won’t have to pay their share of pregnancy and abortion costs.........
The states each have their own set of insurance regulations, I seriously doubt that they have repealed all of their public policy, so it will likely all go back to the way it was in each state.
The Republicans will likely enact "portability" "association health plans" and "interstate competition".
I am sure the insurance companies have such contingent plans ready. Besides capitalists are by nature adaptable.