The main stream adoption of such a technology would require installing bio-metric readers or bio-metric ID card readers at the millions of laptops and desktops

The main stream adoption of such a technology would require installing bio-metric readers or bio-metric ID card readers at the millions of laptops and desktops and tablets. That's very unlikely to happen before 2017. At the most it can be an optional feature offered by a very few top googles and facebooks of the world, just like two-factor-authentication today is an optional (and rarely used) feature offered by google and facebook. IMHO, passwords are here to stay for sometime :)