That results in lack of identity of a team with fans and a further loss of fans. Will the NFL last 20 more years? Between the player demands and the head injuries, it might be the end of the NFL.
Players want contracts like professional basketball. I don't see how NBA owners make any money. They do have 82 games to make money. NFL players only play 16 games and even if they play in every game, it is only half of the game.
NBA regular season runs mid October to early April with 82 games. Playoffs early April to mid June with a possible 28 games. NFL season runs September through December. Playoffs January to early February with a possibility of 4 more games.
NFL players have talked about shortening the season. One fifth as many games with 5 times as many players per team makes for tough economics.