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Hopefully we'll get to a world where people keep a U2F key on their keychain, and use it for all their important logins.

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We have a long way to go. People need to understand:

* How U2F works on their phone

* What if the U2F key gets lost or stolen (revocation)

* How to have a backup of the U2F key

* Are multiple identities possible (home/work/whatever)

I think a lot of this is close enough to the way mechanical keys work that it's not a huge leap. You can have more than one house key, you change the lock if a key gets stolen, etc. It's a little different, but not really more complicated.

One good thing is that we are moving towards where most devices will have USB type c as a port, so that mobile devices, laptops, and desktops can all share keys.

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