For currencies, the US dollar is likely to remain pre-eminent in terms of liquidity and financial use, but seems very likely to lose some purchasing power, perhaps quite a lot. The Euro has some structural flaws but looks like it will endure. There may be another crisis or two, but it will survive those. I'm holding my cash largely in sterling at the moment, with some others.

You have the "opportunity" to move your money around to different countries and currencies. I put opportunity in quotes because I'm not sure if that is advantageous or not. Maybe like the opportunity to dance across a minefield?

I believe most of us here are Americans and so don't have the need or ability to think strongly about different currencies. But luckily for us, the first bit of what you said above is the saving grace for us. If the USD fails, we have much larger problems than the currency.

The father of a close Mexican-American friend lived in San Diego and had a thriving import/export business with Mexico. He told us he fortuitously had moved a lot of money between USD & Pesos just a couple of weeks before they devaluated the peso in Feb 1982. If he hadn't done that he would have been wiped out. Ugh.