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Watching the Lilium jet videos makes me think that the long-predicted era of the flying car can actually happen, providing the AI can be made smart enough to compensate for human insufficiency. 100 years is way more than enough time for smart enough AI.
100 years ago the world was charging, but much more slowly than what we are experiencing now. The current rate of technological change is so rapid that it can be disorienting for older generations.
100 years from now what people in the wealthy countries use for personal transportation will likely be so different that we can barely imagine it.
Nothing to say that we are not reaching boundaries of physics (who knows)... what will really change is the way societies organise and the way wealth and work is distributed. That will change beyond recognition barring nuclear war and ecological catastrophe. First priority is to make planet sustainable, and then remove the Mexican standoff with nuclear weapons.