This is an on-going discussion...
Yes, the US is the first out, but, guess what, they're also the current leaders in the currency race to the bottom. Devaluation of USD suits them just fine and they're taking steps towards that more than any other economy. In particular, EUR, for a whole variety of reasons, will probably be difficult to devalue. Whether that then becomes very negative for the Eurozone economy and leads, ironically, to the weakening of the EUR remains to be seen.
BTW, you should be aware that for every strategist (such as the UBS feller) that recommends one thing, there's another one that would suggest the exact opposite. For instance, the HSBC guys are firmly holding to their long EUR view.