"The Semantic Web may have failed, but higher intelligence is coming to applications anyway, in another form: Cognition-as-a-Service (CaaS). And this may just be the next evolution of the operating system.
CaaS will enable every app to become as smart as Siri in its own niche. CaaS powered apps will be able to think and interact with consumers like intelligent virtual assistants — they will be “cognitive apps.” You will be able to converse with cognitive apps, ask them questions, give them commands — and they will be able to help you complete tasks and manage your work more efficiently.
For example your calendar will become a cognitive app — it will be able to intelligently interact with you to help you manage your time and scheduling like a personal assistant would — but the actual artificial intelligence that powers it will come from a third-party cloud based cognitive platform.
Cognitive apps will not be as intelligent as humans anytime soon, and they probably will not be anything like the 20th century ideas of humanoid robots. But they’re going to be a lot smarter than the software of today." (http://gigaom.com/2013/12/07/why-cognition-as-a-service-is-the-next-operating-system-battlefield/)