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I don't know what you mean by AI being fake. If you mean the Turing test, yeah that is a thing some people do as an exercise but it's not the bulk of AI research and the Turing test is not taken seriously as a good test for general AI.
I wouldn't compare general AI to either warp drive or time travel because it does not require violating physical laws as we currently understand them. I don't think it even requires us to understand our own intelligence or consciousness to create an AI that can solve any problem done by an intelligent person (or many intelligent persons). Most (all?) experts think it'll happen eventually; the only question is when.
AI does go through cycles of boom and bust. Right now it is riding high thanks to neural net, reinforced learning, and big data. We have self driving cars, alphago, smart assistants etc. At some point, AI will probably hit a wall as people realize those aren't enough to get to the promised land, and we'll have another "AI winter" until the next breakthrough.
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