If you consider the metaphor of Nervous System you can soon realize the future Telecommunications infrastructures (e.g., 5G), Cloud-Edge and Fog Computing, Artificial Intelligence and IoT (i.e., pervasive sensoring and actuating) will have naturally to converge quite soon to exploit the Nervous System of the Digital Society and Economy.
The nervous system of a living entity, in fact, is a complex network of nerves and cells that carry messages to and from the brain and spinal cord to various parts of the body. The nervous system includes both the Central nervous system and Peripheral nervous system: the former is made up of the brain and spinal cord (tube like structure which extends from the brain) and the latter of the Somatic and the Autonomic nervous systems. The somatic nervous system consists of peripheral nerve fibers that pick up sensory information or sensations from the peripheral or distant organs (those away from the brain like limbs) and carry them to the central nervous system. The Autonomic nervous systems controls the nerves of the inner organs of the body on which humans have no conscious control ( it includes the heartbeat, digestion, breathing).
These well-known simple definitions are enough to understand the metaphor about the evolution of Telecommunications infrastructures (e.g., 5G), Cloud-Edge and Fog Computing, Artificial Intelligence and IoT. And also the use-case is very clear! The nervous system of a living entity allows the survivability of a living entity enabling functions as to perceive, comprehend, and adapt to the world around us; moreover the nervous system operates the body’s essential physiologic functions, such as breathing and digestion… In the same way the Telecommunications infrastructures will become the Nervous System of the Digital Society and Economy allowing their sustainability by supporting functions as to perceive, comprehend, and adapt to the political and socio-economic environments; moreover it will operates the essential physiologic management and control processes of the Digital Society and Economy. As it is accepted generally now that Nervous System can learn, rearrange, and adapt, a process often referred to as neuroplasticity, so will do Telecommunications infrastructures running A.I. on Cloud-Edge and Fog Computing resources and collecting sensing information from the IoT devices. Virtualization (SDN and NFV) will provide such neuroplasticity to the Telecommunications Nervous System.
So, rather than talking about of CityBrains for SmartCities, it makes more sense referring to global Nervous System (which is much more than a brain) of the Digital Society and Economy.
Eventually my personal take on future Telecommunications infrastructures (e.g., 5G), Cloud-Edge and Fog Computing, Artificial Intelligence and IoT…is that they should be considered systemically as concurring to create an ecosystem, much beyond segmented sectors or verticals. And the biz cases is horizontal: bringing to digital life our Society.