No one knows what will happen when Repubicans repeal ACA, especially Republicans. But here is some educated speculation as reported by the Incidental Economist.
Urban just modeled the bleak consequences of repealing through the reconciliation bill:
The number of uninsured people would rise from 28.9 million to 58.7 million in 2019, an increase of 29.8 million people (103 percent). The share of nonelderly people without insurance would increase from 11 percent to 21 percent, a higher rate of uninsurance than before the ACA because of the disruption to the nongroup insurance market.Of the 29.8 million newly uninsured, 22.5 million people become uninsured as a result of eliminating the premium tax credits, the Medicaid expansion, and the individual mandate. The additional 7.3 million people become uninsured because of the near collapse of the nongroup insurance market.
Big deal for Republicans? No, not really, they don't care.