There's still time for that backslide to happen we're already seeing conservative reactionary groups pushing for returns to before those questions were 'resolved' in more and less direct terms.
I wouldn't claim that a backslide is impossible, but it's important to understand that these weren't just conservative reactionary issues at the time. I have an uncle who got interracially married in the 1990s, and his wife's family were concerned about it because of gender rights - they thought that he as a Hispanic man was going to expect her to be "barefoot and pregnant".
