I am sure they are, but with the options built up during the globalization it will be much, much harder than in Argentina (Cuba, Soviet Union, etc.) in the last century. Not impossible, but very hard.

Also, after three decades of globalization currency controls will hit virtually every business, so this will likely be broadly unpopular. Again, not impossible, but I personally view it as very unlikely without dictatorial powers held by one, or a very few, strong individuals. But we shall see...