he's simon constable, columnist at "the wall street journal." >> if you think things were messy in europe, then just wait for this year. i'll have been commenting on the euro crisis for three years, but i expect my fourth year to be the most explosive. here's why-- a battle has been set up between european government elites, who want to keep the single european currency, and the european taxpayers, who are being asked to endure financial hardship in order to keep the currency. those taxpayers, those people lucky enough to have jobs, aren't that happy about those hardships. nevertheless, the elected and unelected elites of europe seem hell-bent on forcing the euro and the austerity upon their people. in 2011, we saw greece burn due to those hardships. the elites see the euro as a way to make europe more like america, with its single currency, the dollar. and they do have a point-- single currencies have huge economic advantages. but in democracies, we are governed by consent, and there's the problem-- that consent is being tested. my worry-- it won't be just greece that burns, but instead