You say it was a joke but it's pretty clear you genuinely do not understand the challenges involved. The comparison with other disasters is wholly misleading. In the event if eg. an unimaginable natural disaster or an unavoidable war with 6 months' warning, you would likely be able to rely on the charity and goodwill of your neighbors and allies. In this case, however, you're talking about an entirely avoidable self-inflicted disaster resulting from an eventual breakdown in negotiations with your closest neighbors and former allies. Not in any way comparable. Step one in preparing for disaster, for a country, is to not alienate your friends.