no, they shouldn't. they are responsible for a portion of the national debt, the national deficit, maintenance of the armed forces, national guard, power grid, senatorial and gubernatorial representation, and so forth. not to mention all the citizens of the U.S.A. that live in those states who will have to be given the option to move to the nation of their birth and citizenship, that should be at no or little cost to those citizens.
what happens to border patrol, border crossing, trade in USA and internationally, finances, currency, nafta agreements, nato agreements, u.n. agreements, and so forth?
easy to say let them become completely independent, ridiculously involved and virtually impossible when you start considering even the immediately obvious implications.