All I know is if Boston can hold a bowl game OUTDOORS in an old baseball park, a middling bowl game in Minneapolis indoors at the state of the art U.S. Bank Stadium would be a success at some level.
The Mall of America would be an excellent place for a fun official outing for the competing teams with battles of the bands, etc.
U.S. Bank Stadium needs to feature “real” college football on a regular basis (not counting lower level stuff like NDSU, Prep Bowl, etc). That could be early season neutral site games for the Gophers, bowl games, etc.