Roe v Wade was a clear and unambiguous advance for abortion rights, and the battle lines are now arrayed somewhere different than they were before Roe. The fight isn't over, but it's fairly clear who holds what.
I'm talking about even knowing when you've made progress. If a federal directive came through tomorrow expansively forbidding the NSA from collecting data on US citizens, privacy advocates wouldn't even hope that bulk surveillance of citizens would stop. They know better, because it basically happened, and the definitions of words got rearranged until the program could continue unabated.
Political issues aren't settled until they fade into consensus belief, but it's usually possible to make progress and then defend it. On surveillance and privacy, there's no law or court decision or whistleblower or even prosecution that can guarantee things aren't continuing exactly the way you didn't want them to.