Engineers and Scientists
No, it's why we need good education and people doing science and maths at school.
The jury is out on space elevators.
Some sort of robotic repair spacecraft able to stay in a high orbit and be re-supplied from a craft docked at the ISS would be possible today.
While I like the romance of manned (or womaned) space exploration, till we figure Starships (if ever), robotic / remote ships and probes are better. We do need orbital repair bots and orbital "sweeper" bots. Still, amazing how cheap India did a Mars Mission.
[Even if the material issues of the cable of a space Elevator can be solved, the central platform has to be built in orbit. Then you have maintenance. The building of it needs a horrendous number of launches. Mars and the Moon are better candidates for a space Elevator as Kevlar could be used, but some other launch mechanism likely cheaper on Moon (see The Moon is a Harsh Mistress) and maybe on Mars too. A space elevator is a nice idea in a story. The reality is problematic ]