Chrome kept crashing on me as I tried to read the article, but if I understand what I've read correctly put me squarely into the camp of improve-out-of-body technology first. Better understanding of my body's context should not be at the cost of implanting or trusting some technology for a fixed period -- even biometrics. Personally I prefer Bluetooth Low Energy. Easier to swap out ID tools or leave them at home if necessary. Easier to provide temporary or one-time access via smart phones, or use the smart phone as a device to enter a smart phrase or other second factor beyond the possession of the BLE ID or phone itself. Next-generation 2FA will hopefully use Mac support of Bluetooth Low Energy for years now to provide challenge responses for 2FA, making it even easier than reading a number or plugging in a Yubikey, or it could require a passcode on the device but then have the added benefit of easier sharing between computer and phone.