Prof. Somin at Volokh Conspiracy has a book and a bunch of blog posts on the theme of people voting with their feet--moving from one state to another or one country to another. As a libertarian he's all for it.
It's not new, as I discovered when reading the Anderson "Crucible of War" on the Seven Years War. Interesting bit in it--the Massachusetts legislature wrote to the British regarding the demands for more troops for 1759 campaign, recruiting for which would require paying enlistment bonuses. They complained that taxes were already so high that people were leaving Massachusetts for better places.
Of course 270 years later Massachusetts is still wealthy and still a high tax state.