NCAA Basketball Attendance figures through 2022-2023 season

[alphasigko]

Adding weight would likely exceed the design specifications for the foundation and be the biggest expense and most difficult obstacle to a major addition.
That's besides the logistics of removing the roof, adding whatever additional structure would be built above the existing bowl, etc.
which would include myriad details like plumbing, electrical, and HVAC.

Yep! All of that for sure and probably more. The costs will be huge. And this would take the arena out of service for at least one season.