Control services themselves need little capacity. If there really is a market for streaming video around the house, it is just a matter of installing appropriate connectivity either wired or wireless. My assertion is that IP is suitable for a range of functions ranging from control protocols to streaming protocols. The whole notion of automation is flawed. They can cooperate using appropriate protocols.
Some protocols can be fairly generic and span sets of devices.
Others are more narrowly focused. All of the protocols must be simple so that they can evolve. They must be resilient so they are tolerant of normal errors and even maliciousness. Even better, it makes sense to have a large investment in technology so that we can use existing wiring. One example is the Home Phonewire Networking Association .