I get why they made the change (encourage people to show up early), but I don't think they thought this one through. A lot of people didn't sit in their exact seat to begin with, but now you're taking all boundaries in terms of sections away, which will result in people jamming into the sections closer to the sideline/farther down near the field. So you're still going to end up with empty seats in the upper deck, but you will also have lower sections overflowing with people.
Also, camping out is going to be a huge problem. It was absolute chaos for basketball games. Obviously not everybody is going to get out there the night before or anything, but you're going to have to have event staff people out there to maintain the peace if basketball is any indication.
The solution here was to come up with a better system that rewards people for attending games/getting there early/seniority/etc., not make it GA.