Does this mean that Big Ten Football teams can never play on ESPN again?
No, even though ESPN doesn't have a TV contract with the Big Ten anymore as of 2023, ESPN will still broadcast some college football games that feature Big Ten teams. For example, ESPN has the TV rights to air the College Football Playoff. When Ohio State, or another Big Ten team, plays in a CFP playoff game, the game will still air on ESPN. Similarly, out-of-conference games between the Big Ten and SEC or ACC teams, both conferences with ESPN TV deals, could still air on ESPN.