The bigger issue is that there isn't much point to having humans in space.

After the Wright Brothers flight, aviation took off because aviation is genuinely useful. First it was mostly for delivering mail, but that was an incredible change. Instead of a letter taking weeks to get somewhere it would take days. Places that used to be completely isolated from communication now had an easy way to keep in touch. Then with passengers aviation you had something that changes the world in a positive and measurable way.

Humans in space is extremely expensive and there really isn't much worthwhile to do up there. Sure, you can do some science experiments about how zero gravity affects something, and learning things is useful, but there's no obvious immediate payoff. If going into space made your bones stronger and not weaker, space travel would have developed massively because there would be a reason for millions of people to go to space for the health benefits. Or, if ballistic travel made sense economically, there might be rockets that cut the travel time from New York to Melbourne down to a couple of hours. But, having to get all that mass above the atmosphere means that it's far too costly to make economic sense.

People talk about mining asteroids or the moon, but there really isn't much that's valuable up there. The moon is mostly made of ~~cheese~~ [wait, my sources need updating] lunar regolith, which is composed of elements that are just as common on earth: silicon, aluminum, calcium, magnesium, iron, etc. But, on earth you don't have to deal with the difficulty of processing it on another celestial body, nor do you have to deal with the spiky, unweathered nature of regolith that means it destroys space suits and machines.

The only reason the US landed on the moon with humans in the first place is that it was in a dick measuring contest with the USSR. Now that the cold war is over, nobody's willing to pay for something that useless.