MLB is discussing a plan to expand rosters but require that the game roster remains at 25. Basically something similar to what the NHL does, where four or five guys simply don’t dress for the game.
This has been talked about for years as a solution to the September call-up conundrum, where they want to give a look for minor league players but they don’t want to kill the momentum of games with endless pitching changes and lineup moves. But now, they are talking the entire season.
Let’s just say, for the sake of argument, that they expand rosters to 29, an additional 4 spots.