MLB could move the mound back or lower it again like was done in 1969 after the 'Year of the Pitcher', but it's not that simple.

The other crisis baseball faces is pitcher arm health. The mere act of throwing a ball 90-105 mph is damaging to the arm, and it only gets worse the harder you throw. Every pitcher is chasing velocity and spin rate since the resulting success and money is undeniable. Pitchers frequently need major surgery and extended year+ time recovering as a result.

If the mound is moved back or lowered pitchers will respond by doubling down on chasing velocity just to stay level, leading to more injuries and UCL replacement surgeries.

The same incentives apply to other options to give batters an edge, like juicing the ball or shrinking the strike zone. Pitchers will respond with velocity and blow up their arms.