Communication? Sure. Decentralized works well enough. Diaspora?

As far as privatizing the physical infrastructure: your hardware should be yours. Anything past that should be common carrier/ISP. Need an alternative? Good luck.

Decentralize the cloud? Owncloud works on most hardware.

Decentralizing payment software? What do ya think bitcoin is supposed to be?

But decentralizing DNS... Yeah... That's a challenge. Probably not gonna happen non-maliciously for a long time.