The NFL has been actively trying to expanded the regular season in the next collective bargaining agreement, seeking to move from sixteen games to seventeen. Per a report by CBS, the expanded season could see the NFL play games at college stadiums:
"The NFL has also talked internally about playing games in other cities in the U.S. which do not have pro teams, with some buzz about playing a game at Notre Dame or Alabama, as well as Hawaii and cities in Canada. It is viewed as a unique and profound way to grow the game globally and extend the reach of sales, merchandising and broadcast rights around the globe, with there only so much more room for growth within America." - Jason La Canfora, CBS Sports
The current CBA is set to expire after the 2021 season.