Major League Baseball owners want expanded playoffs.
How do I know this for sure? Because last spring, MLB and ESPN signed a seven-year rights extension that includes postseason games that don’t yet exist:
The deal will include 25 weeks of Sunday Night Baseball, the MLB Little League Classic, Opening Night and the Home Run Derby. If MLB expands to eight playoff series in 2022, ESPN will carry the entire schedule. The network currently carries one of two wild-card games.
So, clearly, the reason for the expanded postseason is money. MLB obviously would make more money with an additional round, likely best-of-three series.