One, US has been the largest buyer of imported goods. As much as people think turning away is difficult and needs planning.
Two, turning away requires time and planning. Supply chain isn't built in one day. People need time for that.
In the short term - like next 3-4 years - it is going to look like countries caved. But in the long term Liberation Day will be remembered as one of the days which put a nail into the American exceptionalism.