I think in the long run something as flexible and open as Wave will consolidate a lot these communication channel problems to the point where devs use it predominantly. (And I know we need mutt integration for that to happen :)
Just one example: Maybe it would good for Wave "mailing lists" to implement a message scoring system where valuable messages can be dugg up and flames dugg down.
That would certainly improve signal to noise. IMHO Wave makes crowd sourcing much easier.