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Political isolation would allow them to decide which countries to do business with, and on what terms, in order to maximize their own profits. Instead of a "free for all" market, it could become a "limited for all, except for some chosen ones". The USD has been artificially propped by the USA being "the world police", or the largest bully on the playground. In a multifaceted world, where some large nations start to put that to the test, chances are the USD could stop being the world's currency, making it more beneficial to establish selective trade agreements valued in goods, closer to barter.

They could still solidify Trump's power... or just the opposite: impeach him, throw him away, and put in his place someone they might see as easier to control. For now, having a Republican majority in both Congress and Senate, the threat of impeachment could work to keep Trump in line. As much as Trump's ability to say "yes, no, and the opposite" worked great for people to cherry pick whatever they wanted to hear and vote for him, the same can work wonders to cherry pick the opposite and destroy him. In countries like China, they use that kind of politics all the time: anyone wanting to advance, needs to commit some irregularities that can be used to blackmail them, then throw them under the bus when the higher ups feel threatened.

As the DOGE works its way through the administration to cull down non-political appointments, it can as easily decide to keep Trump loyalists, or Musk loyalists, or Vance loyalists, or whatever. That's one part of the autocoup. For the other part, Trump has already promised no more elections, and to get the term limit removed. But even if he manages to get those, whether he's the one to enjoy them, remains to be seen. Trump's a babbling loudmouth, but Musk has already gained several time more ($100B) on his election, than Trump's whole net worth ($6B, maybe).