I'm just waiting for the first wedding to be called off because the way the bride moved up the aisle, in time to music, could legally be considered a type of dance.

The main advantage would be to reduce the amount of spare parts they need to keep on hand in case they need them in a hurry. Additionally broken parts could possibly be melted down and reused.

Neither am I suggesting that Windows 8 will only run with secure boot. And I would be shocked if that was the case. My worry is that Microsoft will encourage OEMs not to include the ability to disable secure boot.