How did such a
remarkable idea come to mind?

Did he even realize that something so powerful and influential would emerge from it?
I can't Believe but wonder was Satoshi really just one person, or a team of scientist of brilliant minds?
Or could it be that something even more extraordinary amazing things Alien Brain behind this creation?

It's really crazy when you actually look at how big Bitcoin have become. But I don't think we have to involve the aliens in this story. I believe that Satoshi Nakamoto just took a couple of ideas that was already on the table, like cryptography, decentralized network and the idea of digital money and put them together in a way that finally worked.
Even if we don't know whether Satoshi was an individual or they were group of people, that part is actually still a mystery, and if you want to know my opinion I would say that's what makes it interesting. But in history we know that things are often discovered by people that build on other people's work and not a divine intervention, we should just think of It as an evolution, instead of a sudden miracle.
Whether Satoshi foresaw if Bitcoin will become this huge, I don't think they expected it to become so successful. They may have thought it would work out but as far as Bitcoin will become what it is today, I think it probably surprised even him or them rather.