In my opinion it takes a lot more than a few tech unicorns to have national rejuvenation
In a way, I agree, but its really helpful to have a paragon to follow. Like, the leader, the example, the national hero for everyone to follow. So, no, if all you have is the few companies and few individuals, nothing will happen. But the singular hero (the company, the personality) can act as a rallying point for other things to coalesce around.
First you have to transform American economy from financialized economy into manufacturing economy
Yep, and I think this is a critical step which the US will have a lot of trouble with. This is what Biden's Build Back Better program is all about, and what all the "slave labor in China!" thing is all about, and so much more. But having a company that's popular and dynamic like Tesla and a company that's doing big things like SpaceX will drive manufacturing in-house (in terms of nation) as well. Historically, Boeing being in Washington drove a lot of smaller companies to be in Washington as well, bringing the industry there. A single large company will feed a lot more mouths than just their employees. Tesla building cars in China for the Chinese market was a huge win for China. I don't know which bureaucrat came up with that but man, that was a hit right in the fundamentals for the US.
Second you need to have national unity, with political polarization and overall leadership incompetence in the us is so severe, its unlikely a leader who got the full support of both conservatives and liberals emerge
Yea, I don't know enough about the national unity to give an opinion. I just want to say, I do think its partly the Russians throwing a wrench into the US political discourse and for that I say, job fucking well done Ruskies.
Third you need to have actual Americans to study STEM again,
These things can change pretty quickly. This COVID-19 thing drove a lot of interest in the health-care sciences, and the bitcoin thing drove a lot of interest into the computer sciences. And again, having a company like SpaceX can be exciting and drive interest. These things can change on a dime. Remember when "Top Gun" the movie came out and it drove a recruiting surge for the Navy. These things are fickle. And while a new "Top Gun" might not drive military recruiting today because people are more cognizant of what the US military is for, there's no stigma attached to being an Astronaut or Engineer or Scientist for the US MIC, all they need is a Top Gun moment of their own.
If Elon Musk does get his dream and SpaceX and the US puts the first person on Mars, there will guaranteed be a massive jump in US STEM enrollment.
That said, things are good right now, for China. The trends are in China's favor.
(article from 2018)
What I'm saying is, things are trending in China's favor, but the race isn't done. And if the US does experience a renaissance, it'll come from SpaceX, and I think the Chinese strategists would be a lot happier if SpaceX didn't exist.
As an aside, here's an article on the Boeing Bust of the 1970's, and a small look at how a single company can affect an entire region.
Its just a fun read, I think.