The economic development of the United States is very healthy, the dollar is hard to collapse, and the trade war between China and the United States may lead to the collapse of China's economy!
The high volatility of cryptocurrencies also has the potential for bubbles, and only gold and silver have real storage value!
I don't know what your sources are, but America is not doing that well. There are some short term economic patch ups done, but China owns 1/3 of America's foreign debt. Which means China has the power to influence the dollar at will. Peter Schiff was one of the few who predicted the crisis in 2008 and says there will be another 1 in the next 3 years. I'll say that America is gonna look for another war to cover up the upcoming crisis, but that's just me speculating
China has the power to manipulate the dollar but it wont. They are not willing to go to war with the nation that has the greatest military might in the world. Its more prosperous to cooperate in peace and through negotiations lol.
The trade war will be to the advantage of the Americans and we will see that in 10 years.