Beth Sarim - First, welcome!
OTWO & Tuesday were just throwing predictions out there! I'm actually suprised they haven't reduced the DCs to 2 days already. Remember they used to be what 7 days? I'm old enough to remember the 4 day, then the shift to 3.5 days and finally to the current 3 day. I agree with OTWO that they will move to a 2 day DC sometime shortly under the theory that they can get a similar donation amount but reduce their expenses. I guarantee that NO ONE will complain about it either. The Friday attendance is usually 20-25% lower than the Sunday peak so it really makes sense. I theorize that the reason they haven't done this sooner is they get such great deals on the various venues that are used around the country that the costs savings isn't enough. Of course, in some cases (such as in the NYC area), they're using the existing assembly halls for DCs (albeit smaller gatherings). If that trend continues, they may not reduce it to 2 days since they will want to make sure the buildings are being utilized as much as possible.
Whatever the case, it will come down to money. That is the number one concern of the organization from my point of view.