Statistically, almost by definition, there will never be "a lot of people" who "want out of big cities." And it wouldn't work anyway. Not everyone can homestead for their Raw Milk.
The global trend historically is towards urbanization, except perhaps in the post-WWII period in the US, but the latter was always driven by massive incentives, regulations, and "red-lining" segregation.
However, Europe and Asia build cities that allow for urban density and effective urban transportation by default... In the US, it's the exception, and in most places it's literally illegal to build things like high-density housing and pedestrianized boulevards.