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A diminished USA is going to leave a vacuum which, regardless of the current behaviour of the USA government, is not going to be a good thing as Russia and China rush in to grab what they can.I actually view this as a good thing. Power should be balanced amongst multiple super-powers, instead of a single one.
In latest years the U.S. has been able to strong-arm other countries into laws and agreements that align with U.S. laws or that benefit the U.S. to the detriment of the countries involved, with examples being the EU Copyright Directive, ACTA, the various patents reforms, the EU data-sharing agreements after 9/11 and so on.
Right now the U.S. has the power to extend government-granted monopolies to the whole world or to squash rights that citizens of other countries could otherwise have.
This only happens because the U.S. is able to wield so much economical and military power. It's unnatural, goes against the principles of a free market and other countries can no longer develop in its shadow.