Why is it taking so long for houses to be fully wired?

This should not be so difficult to do. Every appliance in the home should be linked to a computer network, perhaps wireless. You should be able to monitor and control every appliance in the house using a computer system including television, washer, phones, and lamps. It should be possible to schedule when things go on and go off. It should be possible to use this system to record television and radio programs and to reroute the output of the telephone through your stereo speakers or record conversations. It should not be that expensive either. Why is this not happening?