A single individual with a computer can be more productive than 100 individuals from any of those past projects. We walk around with more computer power in our pockets than the entire computer power that got mankind to walk on the moon.
But that is not the point.
The point is that a mooonshot is only a moonshot relative to its time.
In other words, we would need to imagine what a project, that could be accomplished with half-a-million (or more) people working in cooperation toward a single end goal, would look like today.
I can guarantee you that would look something along the lines of a partial terraforming of Mars.
Hacker news complains about the lack of innovation and invention, and yet continues to support a tech-world with a "solo founder" mentality, one man sitting alone in a room coding an app ... You'll never get a moonshot civilization pushing that attitude.