The reason I believe this will radically change both the way we interact with computers and their capabilites centers on the core contribution of Google Wave, namely, convergence. What this offers is a chance for autonomous intelligent agents (i.e. computers) to easily gain access to not only the final product of communcation and collaboration but to the very process itself. Furthermore, rather than cast them in the role of passive observer it places them on equal footing with the people involved in the process.
It turns computers into collaborators.
This provides the potential for agents to gain easy access to all the elements essential to learning: observation, interaction and feedback and opens the door to a revolution in our relationship with machines.