maintaining state residency should not be a problem. the states want to keep taxing you on your investment income for the rest of your life, or until you claim residency elsewhere. it's getting any state benefits that could be a problem.
i'm still registered as resident of texas, still mail in ballots each election, do annual federal tax form but no state forms for texas, even after 15 years in aisaland.
but you might lose your drivers license so outa luck if need to rent a car. texas license can be renewed only once online, next time must be in person. and international license is based on your state license.