My biggest fear would be that there would be some who would take the 'use it or lose it' mentality. Either through felony disenfranchisment or similar. The individual is otherwise removed from the register of electors until they undertake a complex and onerous process to get back on. It's something that would make voter suppression far easier, because all you have to do is change polling times/dates to ensure that your choice demographic is the one most likely to turn up to the polls, and at the same time effectively permanently remove demographics that would normally oppose you.
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--m(^0^)m-- Wot, no sig?
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--m(^0^)m-- Wot, no sig?