If idealism were true, then it wouldn't be idealism, since everything that makes up the concepts with which we stake out that position: consciousness, subject, objective world etc., would be so far surpassed that the concepts would no longer stand. The same is true for every metaphysics: if materialism or naturalism were true then matter or the laws of physics would no longer be what we take them to be. In a purely intellectual sense all such views would self-destruct if they could ever be finally validated. This is perhaps why metaphysics is understood to lead to nihilism. Behind all such positions there are inferences about what kinds of experience are possible or impossible, about what can be relied upon, what is worth pursuing, what kinds of attitudes can stand or fail to stand the test of possible experience. In the end all that remains after the inessential is released are kinds of faith, comportments of the heart towards reality. All the rest, the arguments, the systems, are elaborate distractions.