Trump said he wasn't going to seek to reverse same sex marriage, as a pro-marriage guy. Courts have reversed rulings before, and the Oberfell decision was legislation from the bench "out of whole cloth", but the emotional aftermath would be a nightmare he doesn't need.
If overturned, you're still legally joined in states that recognize it but may not be for state purposes in states that don't.
I think we'll see the ending of same sex marriage as a legal whip against conservatives and Christians.
If you preach traditional marriage, the civil rights act will no longer be warped to say you can be punished for hurting the feelings of homosexuals and private schools sued for teaching such messages.
That LBGT activists will not longer be allowed to sue florists and bakers who refuse to provide service they find blasphemous, while state's civil rights commissions repeatedly said the exact opposite situation is legally protected speech - an immoral double standard.
I also expect the transgender insanity to go away, where church homeless shelters and public schools are told that if you want federal money, you must let mentally ill biologically intact men (often still attracted to women) in women's shelters, girls' locker rooms, dorms, bathrooms, etc regardless of the privacy and safety of women. And that Trump can change almost immediately by fiat by removing "sexual identity" as a class to Title 9, something it was never covered demonstrated by Barney Frank trying several times to amend it to cover that group.