[hobbes]

Email didn't evolve with Gmail. Only the UI evolved.

It could be suggested that Wave was a revolution rather than an evolution, and that was its greatest weakness. I'm sad that it's gone.

[agerlic]

Not completely gone, it still exists as Apache incubator project : http://incubator.apache.org/wave/

[hobbes]

True. But for it to succeed and be widely adopted, it really needs an organization that is able to host it for the masses.