I have been hearing alternate sigin-in methods in last good 10 years , from biometrics to typing behaviour to human behavior and what not.
Even a 99% accuracy is not enough for a security tech to mature, specially when it comes to credential management
Unless someone brings the whole new vision to VR paradigm, this pig not gonna fly. Its been 4 years, much investments and still no adoption outside media labs
Any redesign of a popular platform should be validated against the value it brings vs the learning curve it introduces to the existing number of users.