Kudos to CBS/NFL for the crowd noise added to the broadcast. It was really well done. If you did not know it was fake, one might not even notice.
But I think there is a better solution. Put an Alexa speaker (or google assistant or other similar device) on each seat, and let fans "rent" one for the game. An app to play the actual fans screaming in their living rooms would be fun. Players could actually pump up the fans.