The vast majority of people in the US still see their future in the US. Dual citizenship, much less actually living abroad, is still an extremely niche topic and basically only a thing amongst upper middle class and above professionals and tech workers.
And as chaotic and concerning as many political events may be, the idea that the US will become “a failed state” is pretty divorced from the actual reality of what that term means. If the US becomes a failed state, trust me, the rest of the world will be too.