I reallllly wanted to do this in the beginning because it's so simple. However I think I came to the conclusion that forcing people to go in and out of their mail client every time they wanted to login was too much of a barrier, however I'd be easily convinced if people thought it was a better and more viable way to handle login.

This is a ridiculously bad idea that’s been debunked as insecure and worse for usability dozens of times.

Requiring a webcam and signing in by recognising interpretive dance would be a less crap idea.

It would be a good idea, most websites you don't need a password to login anyway, you just need to uze the password-reset form each time!