I like your ideas. One issue with opening night is that in a normal year that is October, the start of baseball playoffs, middle of NFL and College seasons. You won't be able to get access to any of the stadiums they have been wanting to use. MLS arenas could work, but the spectacle is playing in Wrigley Field, Yankee Stadium, Michigan Stadium, etc. Nobody knows what Red Bull Arena is. You could probably use something like RFK. Also, if you wanted to do it NFL style, with last year's Cup winner opening the following season, the lag time may not be long enough to do it. They would have to get creative with stadiums to make opening night work.