Hard to believe even a few weeks ago, but now pros are talking about how the weakening euro could fall so low it could trade at parity with the dollar—or even lower.

The euro Wednesday was down about a half percent to $1.18, a nine-year low, after euro zone consumer prices fell on an annual basis for the first time since 2009. That fueled expectations that the European Central Bank will soon launch a quantitative easing, or bond-buying program. The common currency has lost 2.4 percent since the new year began, amid expectations of QE.