Maybe you're reading a different version of HackerNews but I've found the amount of politics discussed to be fairly low compared to other outlets + in this case it is actaully relevant and an interesting point.
Also, look at the other content, this didn't come from nowhere.
I think that the majority of them will realize that salaries for academics are pretty low compared to the US, and they will either join private labs or professionalize.
€10K seems high to me. In France it would be lower than that, I think, save for maybe a handful of outliers. Google search suggests top earners in physics in academia in Germany is probably between €80K and €90K, or maxing out at €7.5K a month.
A lot of their researchers are immigrants and will just return to their country. New students will stop coming and stay in their home country. America is cooked.
No, attending a US university in a STEM subject is one of the only reliable ways to migrate to the country now that they've made it much harder to get H1b visas. The flow of immigrants seeking an American education will not stop any time soon.
That still involves H1B though? Student visas are non-immigrant, you still have to transition to an immigrant visa like H1B to actually stay past 1+2 years of STEM OPT