PJ, I disagree with you. The conservatives on the Supreme Court won't care there isn't an alternative. In fact, it will be a bonus for them. They would see it as four years of guaranteed anarchy during the Biden Presidency.
Once they rule against the ACA, the problem becomes getting any healthcare plan through the court. They will effectively veto every plan. The public will see it as Biden and the Democratic Party's fault that they can't fix the health care system the conservatives broke.
The only way to have even a low functioning healthcare system is to unpack the Supreme Court by adding more justices. If you don't do that first, forget about any healthcare plan and women's reportative rights.