Social Democracy has no historical goal (not since the belief in progress was crushed by events in Germany and Austria in the '30's). Taking a long view, I guess that's always been one of its main problems. Still, it's done more for ordinary people than any other ideology, so maybe that doesn't matter much.
It
once did. And that's a big part of the problem - it can no longer provide "a Yes, a No, a straight line, a goal". I'd sooner see it return to the historical mission of the Left than continue on its present course.