But even with the blinking feature, the lock can be bypassed. But Google is not  done, in the patent application, it details some of the ways people will be able to use their faces and expressions to unlock their application & devices.
Granted, some may not be too keen on these new features. Your phone may soon ask you for this, stick your tongue out or wiggle your eyebrow to prove that it is you that is trying to unlock the phone and that you are following the instructions on the coming screen.
There's no guarantee that Google will ever go through with the new idea, as patents these days are filed more for the sake of it.

But it does show that Google is very serious about new authentication and security methods. In fact, these next generation authentication systems are only a few years away, if Google has its way.