Capitalism, in its purest form, is like a recreational drug. It can kill you and it can and will kill any country who practices it or, in the case of the US, abuses it the same way you abuse any drug.
Socialism, in its purest form, can and will also kill any country who practices it exclusively, or to the extreme.
It is not unusual, and many global examples can be pointed out, that a country can and do practice both, in varying degrees of either moderation or not, when and where called for, to sustain itself and its people. Those are the countries that will survive in the long term.
The others, the US included, will destroy themselves from within, from socialist extremism, or capitalist extremism. The answer lies, as is the case in many things, with the understanding and practice of both approaches, depending on specific needs at specific times, with a practical balance in use.
Example: The American people and the US itself, will never survive if the government provides for all of their needs anytime they need or want it. Conversely, America will never survive if its entire population risks full loss of all assets and complete bankruptcy every time they go to the doctor or hospital for a diagnosis.
No rational person who is paying attention can deny that China is waging economic war against the US and that they are practicing intellectual thievery in the process. But like Russia, China is gonna do what China has to do to make it through the next 2000 years. And its government recognizes that vacillation in principles is sometimes required. They are not embarrassed and will not apologize for it. I know these people and especially their businessmen very very well. They function day to day with a much higher level of maturity and discipline than US businesses and business people do. And they absolutely are capable and willing to sacrifice short term profit strategy in executing a long term game.