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Fortunately builders, tinkerers, entrepreneurs, and other visionaries frequently ignore what academics say is impractical.
Many academics have been working on this too, for years. And are still doing just that. Many don't think it is impractical.
For now, it just hasn't lived up to the hype (ITER, anyone?). But again, who knows? I'll be happy if it happens. I just wouldn't bet any money on it, especially not on the timeframe set out in the linked article.
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