If the world was just Taiwan would be a member of the UN. What exactly is China going to do anyway? Taiwan is a free nation and the free world should not be beholden to the Chinese Polit Bureau. It amazes me how the world cowers at the rantings and demands of oppressive regimes. The response should be “grow up” not capitulation. Do what is right for a change instead of being held prisoner to the rhetoric of the oppressor nations.
There’s also that the PRC is one of the five permanent members of the UN Security Council (the de facto leaders of the UN). Legally if the PRC opposes Taiwan’s membership, even if all the other countries (and the four other permanent Security Council members) agreed to give Taiwan membership, the PRC could veto it.