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My math is questionable, but won't that happen in about 2070? (6 years to get 10% of the way, so about 54 years for the other 90%)?

Will we even be using metal and electricity still, or will all devices be made of superconductors and use quantum entanglement for data and power?

That's linear extrapolation over 6 years, but the progression isn't linear. For example, the first million took 3220-2055 = 1165 days (https://news.ycombinator.com/item?id=1, https://news.ycombinator.com/item?id=1000000). That's over 3 years.

At that rate, it would be 270 years+ to get to 100M.

You would do exponential average rate of change calculation over linear progression to compute an estimated date.