I don't think so. He's their leader and much more than GK. Löw trusts him.
Leader or not, he's a goalie with zero match fitness. If this backfires and he makes a blunder, Löw can say goodbye to his job.
And i'm pretty sure he knows this. Did you listen to Löw's press conference when he revealed the world cup squad? A little reading between the lines and you notice that he isn't confinced at all. It more looks like Neuer is just too big of a name to drop.