[overcast]

Yes, and thus the reason it hasn't caught on. It's such a better idea than 75% of the passwords being Winter2016 though.

[StavrosK]

Agreed on both counts. Given the imminent Persona shutdown, and until I can move it to Portier, I've implemented it on Pastery as a stopgap: https://www.pastery.net/login/

I think it works quite well (the session lasts until you log out).

[overcast]

Did similar at Link Packets, http://linkpackets.com/ - more of a proof of concept / handy thing project.