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.