I don’t pretend to know the future. Things can change radically or things can stay the same for decades. I see no reason to assume anything. I am not optimistic, but I am not going to stop fighting just because of that.
I wasn’t optimistic about stopping the war in Iraq. I still marched against it. I wasn’t optimistic in SCOTUS not ending Roe v. Wade. I still marched against it.
Maybe you don’t see the point of fighting even when change isn’t likely, but making a mark on history is worth something.
Remember this man? He knew he was not going to win. He did it anyway.