But they are disconnected, one is running on the client, the other on the server. Regardless of any magical unified framework, there will be two processors talking asynchronously over network protocols. GWT does this kind of integration and it's far from a panacea.
Apologies for poorly making that point. That is, my point was that we need more ways to embrace this separation. I'm not sure unifying the language on client/server would really help.
