In a piece in Wednesday’s Wall Street Journal, about Greece’s economic status and its relations with the rest of the eurozone, Matthew Karnitschnig had this remark

[A] Greek exit would prove that the eurozone isn’t inviolable and trigger speculation over the future of other weak links, such as Portugal, Ireland and even Spain, in the currency bloc. The euro crisis could return in full force.

Perhaps the crisis could return. But only briefly, and only if misunderstood by the leaders of the eurozone. After all, what’s the long term (or even the medium term) downside of losing “other weak links” in the eurozone? What would be left would be, by definition, stronger.