Taiwan has never declared independence from China. Popular opinions aside, the ROC govt still officially adheres to the One-China Policy which considers it to be a single country together with the mainland.
With the US unreliable and distracted all bets are off on how this will unfold, the chances China attempting to take over Taiwan have substantially increased.
I think what's missing is that opinion in Taiwan in actually split. The KMT, certainly up to the last president in 2016 is simply opposed to declaring "independence" because they share the position that Taiwan is China, just obviously not the PRC.
That is only because of the history of the KMT, which is only a fraction of the story of Taiwan. By the same token the Dutch could invade Taiwan tomorrow morning and claim re-unification.