Unless the sentiment on the outcome is positive and EUR rises... and would the outcome, regardless, be favorable to Swiss arrangements?, in which case USD could do the inverse and CHF gains strength, or the pair doesn't budge. Ahh, the joys of Forex! X-)
I don't think the moves on other pairs would be as pronounced, but they are likely to move, which is what we traders want... direction is the tough one though.
For every loss there should be at least an equal and opposite profit.