I'm mainly surprised by the "we" used by Satoshi: "We propose a solution". Because of his sudden disappearence, I always assumed Satoshi must have been one person. Satoshi's last post didn't sound like someone who expected to disappear: Added some DoS limits, removed safe mode (0.3.19).
If it's one person, I can imagine he had an accident, was jailed or got murdered. If it's a group of people, that's much less likely.

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Up to the next 10 years! If I dare make a guess for the Bitcoin price 10 years from now, it's going to be anywhere from $10 to $10 million. In the past 8 years, Bitcoin went up in value ten thousand fold. The growth will eventually have to turn into an S-curve and slow down. You may quote me on this 10 years from now