Just so that the mourning is relieved a bit, AoU is still leading Avengers in local currencies by 20%. That is not a number to ignore. Yes, the exchange rates, and thus profits, are low, but it indicates that these films remain immensely, and increasingly, popular around the world.
Footnote #1: on the other hand, admissions and ticket sales in North America will fall about 30% compared to the first one, if not more.
Footnote #2: With China coming, the lead of AoU in local currnecy can only increase and maybe ultimately compensate for the bigger decrease in North American sales (although when that is converted to dollars it admittedly might not be enough).