Eventually that card will disappear (if it hasn't already) and soon the USA might even up being the nation that gets carved up peace meal if they cannot get their act together to solve its own issues. That Taiwan card has long since stopped being viable the moment China demonstrates that blockading the island itself is a far cheaper option and literally one that the USA simply cannot counter without expending all of its now critically low stockpiles. They are now looking to Greenland and Cuba instead for a easy win since the Ukraine and Iran wars are literally emptying the vault without any kind of gains what so ever.
That card is already useless.
If the Americans push China to war over Taiwan tomorrow, they will almost certainly loose the fight militarily, and the more time that passes the worst they will loose.
That means they loose the bulk of their air and sea power, as well as essentially all of Asia to China as China systematically eradicates their military bases in the region, and American allies can flip sides and bend the knee to China, or be effectively destroyed as relevant military and economic powers, if not outright conquered. The PLA’s focus has long moved on from Taiwan to Japan, as the balance of power is so overwhelming that there is no possibility of Taiwan holding out, so the priority is now on how to effectively end America’s ability to continue attacking China conventionally once the battle for Taiwan is won, which means driving them out of Asia to Hawaii and Australia at a minimum.
That in turn means the end of America’s overseas interests as they will then no longer have any meaningful ability to protect those interests against local regional powers who have long chafed under American containment. Which in turn will certainly spell the end of the petrodollar and the collapse of their economic foundation.
That was why Trump went with his trade wars instead, because they could not win a real war. And we all know how those trade wars went despite China deliberately pulling its punches to help manage America’s decline rather than seek to destroy them economically. That is how confident China has become, that they are not just concerned with winning, but winning in such a way as to give Trump a way out rather than going all in if he has nothing left to loose.