My vision of the open Web: WebRTC-to-SIP, Web(socket)-to-XMPP gateways, end-to-end encryption everywhere and the invention of some easy publishing in-browser protocol in order for everyone (including those on mobiles) being a server just as easy as being a client.
The WebSocket->XMPP gateway is a great one.
Of course encryption. I probably should have mentioned that, but I was more focused on the data than the transport.