Satoshi wasn't really disappointed; to be honest, he was one step ahead, and that's why he said he didn't have enough time to convince. Because he knows he has created something revolutionary, and Bitcoin will speak for itself in time.
you are actually right sir. satoshi was not even 1 step ahead but was 100 step ahead of an ordinary man. because to create something like bitcoin with monetary value, decentralized and runs on blockchain is truly a remarkable something that was properly programed and designed for the future ahead, and he doesn't have the luxury of time to explain everything since it will look delusional to people at that time, that's why every of the word he says was like parable or prophesy. because he was far ahead of civilization. and no body could read the lines in-between till now. every of his explanation needed time to prove it because according to his diagram in my assumption, bitcoin demand will be high, so bitcoin needed maximum adoption to get recognition and since it is a decentralized system that is not controlled by a centralized authority then it will become a more reliable place or a safe heaven for people to invest their money. and that could only be the way adoption will increase. and also since its limited in supply unlike unlimited printing of paper money people will prefer it as a hedge against inflation. satoshi saw all this from the beginning but no one could see until now, kudos to satoshi Nakamoto for being a solution to the world.