Abortion is one issue, a big one.
Seven out of ten Americans support the right to choose and only 10 percent want it outlawed without exceptions and politicians usually respond to voters.
Good justices usually stick with precedent if there no legal reason to do so. Then there is the vetting process in Congress. Even if a wildcat nominee was chosen by Trump the odds of him getting confirmed is about zero.
I used to vote with this issue as a key one but no more. It is wasting a vote if all you can get out of it is lip service that a candidate opposes abortion. Move on to the other issues.