Speaking for myself, I don't expect the US to collapse anytime soon, from what I can tell there are many here who are doing well for themselves, or at a minimum living comfortably (upper) middle class lifestyles and that certainly would not be a favorable outcome. Clearly, the US creates opportunities for wealth and prosperity, otherwise we wouldn't be living and/or working here.
That being said, just because some of the population is doing well and headline numbers look looking great does not mean there are wide socioeconomic disparities that impact quality of life and standards of living for the many that get overlooked. It does not mean there aren't challenges, policy failures, corporate abuses/excesses that deprive workers of wealth and prosperity, etc thatlead to said disparities. It is fair to call out and critique those sore spots in the US economy, just like it is in the Chinese or another economy where its fashionable to levy such analysis.
Only 20% of Americans are living noticeably better or without worry. You have 60% living from paycheck to paycheck. It is understandable since rent is 2k or higher and you still have to worry about taxes. Then you have people living in RVs or homeless. You become a debt slave after you are a born... college and credit card debt are at all time high.