Yet.
There's big money and brilliant minds working on this all the time.
It will happen and I am gonna post the biggest, most mean spirited, stick in the eye vanity you have ever seen when it does.
There's too much money at stake for it to be ignored. MS is edging closer everyday and others are following suit.
Just like they are on cancer, and AIDS, and drug-resistant bacteria?
There will ALWAYS be a way out. Whether you believe humans got here by evolution or not, there's no doubt it exists in today's world. And anything Microsoft and Intel might come up with will simply be cracked, or purely circumvented. You want the perfect way for Apple to get back to a 25% market share and for Linux to REALLY take off, using Crusoe chips or something? Just create hardware and OSes that physically refuse to let its users do what they used to be able to do. A lot of people won't even bother hacking, they'll just switch.