There are two possibilities: railway/dotcom bubble or monorail/bitcoin bubble ...and I'm not sure which one it is going to be yet. In the first case, a lot of people lose their investment, because they got too greedy and believed in huge returns...but the infrastructure remains and there is a net good to society and time spent specializing in it is worth it afterwards. The second, not so much, it is just a hype cycle with almost nothing of use left once it is gone and a lot of wasted time. I'm leaning towards the first, but if they don't find a way to bring energy costs down, it might end up in the monorail/bitcoin scenario...maybe 10% chance.
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