The pitch will be that people will have freedom of choice and not be forced to buy health insurance. That eliminates the financial base for the insurance-only people with health problems or histories will seek coverage. Insurance companies are in business to make a profit. there are no nonprofits, they put their profits into payroll and bonuses. Rates for policies matching the ACA will be huge. Policies with huge deductibles will be available and the Republicans will offer health savings accounts and a flat tax credit, claiming this gives people access to insurance.  Along with this they will cut Medicaid, by various devices. Millions will have no health insurance or policies that are virtually worthless.
ACA isn't perfect, but it can be tweaked. The Republican approach has insurers in the dark, confused and pulling back because they don't know anymore than we do.
Next: turning Medicare and Medicaid over to those who can make millions and cut benefits.
Be aware, scared, and noisy.