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.
"The upside of open borders," he once wrote, "would be the rapid elimination of absolute poverty on earth." He is relentless at rebutting objections. It would take jobs away from native-born workers? It'd hurt growth in poor countries as more and more people leave? It'd leave us vulnerable to crime? No, no, and no.