Polling indicates record numbers of Americans want to leave the United States, with the most recent poll I could find placing it at 16%.
However, data shows that few Americans are actually leaving. This is despite countries Americans want to move to including Canada having higher rates of immigration.
Let's look at Canada specifically because many Americans want to move to Canada, more than any other country. More Canadians moved to the United States than the other way around even in 2019 the last year before the COVID pandemic. In 2019 only 10,800 US individuals moved to Canada to get lawful residence. 11,388 Canadians moved to the United States that year.
Compare that 10,800 figure to the total of over 340,000. Why does it seem Canada is prioritizing other nationalities over the United States? In the US Mexicans are the largest immigrant group and Mexicans apparently have an easier time moving to the US than their American immigrant counterparts hailing from other countries. This is despite a language barrier as well.