I had a college history professor that made the same assumptions as you, i.e. everything being connected. He also linked in the fact that paper money would be non-existent and all funds would be electronic. Sounds feasible and not necessarily a bad thing, except when he tied it into a government conspiracy theory. For instance, a fugitive on the run for some random crime could have everything he owns shut down remotely. All funds would be locked, and with no cash alternatives... his options would be limited. His car would be shut down remotely (already possible with OnStar), and everything else he is known to own would become virtually useless. The advantages of such networking would be massive. But, the possible control that could be held is a bit daunting.