I'd never considered open borders as a serious political possibility - but then I lost my passport while traveling this summer. The complete bureaucratic mess that has ensued as I've tried to replace my passport and student visa has definitely made me wish for more open borders (for purely selfish reasons). There are serious scholars arguing that open borders would end global poverty as we know it and not unduly burden wealthier countries. I'm not completely convinced, but perhaps this idea is worth more serious consideration.