It does work! Throughout the show, two large screens showed live data from a 1 GHz mmWave + 4x4 LTE MIMO system. The results were consistently between 19 gigabits and 21 gigabits. About 1 gigabit was LTE, an example of the gigabit LTE that will be sweeping the industry in the next two years. The mmWave gear ran consistently at 19 or 20 gigabits. While Huawei said nothing about availability, I infer 2020 is the target for working production equipment for mobile.
Not one of the dozens of network engineers I've spoken to lately disagreed with Ted Rappaport's conclusion "It will work." While we have no field results on millimeter wave to consumers, there are decades of results of mmWave for backhaul, high-speed point to point wireless, and heavy military usage.