The last line is dismissing the third option but it’s not clear what he thinks Wittgenstein’s failure was (lack of recent popularity?).
Feser seems to be saying that Wittgenstein could not completely demolish the “‘concretizing’ tendency” just by pointing out its inadequacies. He had to offer a metaphysics of his own to replace it, and this he failed to do.
Feser seems to be saying that Wittgenstein could not completely demolish the “‘concretizing’ tendency” just by pointing out its inadequacies. He had to offer a metaphysics of his own to replace it, and this he failed to do.