The large drop in the Euro's value vs. the dollar may well portend less visits from Europe. Euro has dropped apx. 25 to 30% in the past year or so. And the South American economies often are in boom & bust cycles. Often, those visitors are the difference between profit/no profit for many businesses.
But you have to understand an American vacation is still very cheap for Europeans. Not as much anymore, but I dont believe the general consensus over there is that the trip to the parks has passed the threshold for money willing to be spent on a vacation.