Could be. In the long term, the world needs to reckon with the fact that our implementation economic systems (capitalist, socialist, fascist) depend on population growth, and isolation could also mean removal from the chaos that ensues when the existing political systems can't cope. Assuming the US improves its situation, which believe it or not is oh so slightly better as a result of what's going on now.
You're right, I don't believe it. :)
How does losing a compensatory supply of labor across both low and high skill markets, cutting off ourselves from backup, discouraging fertility rates, and kneecapping any incentive to invest in manufacturing domestically AT ALL help the situation?
I'm on your side on the political issue, but the data do not agree with you: The states with the most restrictive reproductive laws have higher fertility rates. I'm not claiming there is a correlation -- but rather fertility is not at all governed by reproductive laws (or even motherhood support, because those states also have shit motherhood support systems).
To answer your question: Surviving into an non-population-driven-growth regime requires primarily two factors:
- reducing reliance on financialization
- reducing reliance on pure consumption
I'm not saying the US is good at either of those two (it's not) but it's better than it was, say, in 2019. I would even look at your retort -- it used the word invest. That suggests a heavily financialization-dependent mindset. If you are looking through those lenses, it is difficult to imagine what the future needs to look like.
Trump's economic and immigration and foreign labor policies do not encourage anything that mitigates the disaster of demographic collapse. We're making ourselves even more sensitive by taking away all the safety nets our economy could fall back on.
In the case of the US the result is isolation. That means loss of economic strength as well as loss of political influence. Those are more expensive than they sound because the second and third order consequences are security concerns and more powerful coalitions in opposition.