I think the next four years are going to be very unpleasant for Republicans. With Biden actually trying to fix things Trump broke, the end of the Covid-19 fiasco, the stock market roaring back, and Democrats in the majority in both Houses of Congress, Republican congressmen might as well just go home. The Senate will nuke the filibuster, and that's it: Democrats will do what they want, and Article III gives them the power to make any law they pass judicial-proof.

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the Supreme Court shall have appellate jurisdiction, both as to law and fact, with such exceptions, and under such regulations as the Congress shall make.

That's an enumerated power, and nothing short of constitutional amendment can remove it. So congress can make a law that says abortion is legal under any circumstances they want, and say explicitly that no court can challenge it. Or they can do whatever they want with health care or the ACA, and do the same. No need to pack the court, if you can just legislate around it anytime you want. Of course, they do have to not overstep, since they do have to get reelected. But supporting popular things like abortion access and the ACA don't lose elections.