I thought about that – but the same players remain on the field. I never thought about this before today. Prior to the 1960s – many players played both ways in football.
It would be interesting if baseball put its 9 best batters at the plate and the best defensive players on the field. Or even more interesting, having the ability to bring a pitcher back into the game after taking him out. I coached in a little league for years where all players hit and you could take players in and out of the game. I enjoyed that more than regular baseball rules because it allowed all players more participation and it was just easier to coach.