You ever heard of McCormick Place???? They could do all the NFL Experience stuff in there easily. My opinion from day 1 is they should have gutted the interior of Soldier field and left the outside rim. Bring the ground level up to the bottom of the columnades and put underground parking underneath with a park above. In the parking lot south of Soldier they should have built a 80k seat retractable dome to host the final four, SB, etc. One condition - the roof could never be used during a Bears game.
Peace