Shrinking stadiums lead to higher prices, whcih lead to even lower attendance. they should make the ballparks bigger and lower ticket prices.
They need to build ballparks like old Yankee Stadium, the Polo Grounds, or Tiger Stadium, with fairly short foul lines and deep centerfields. Fair for everyone, and it might help curb the homerun/strikeout/walk game, which is a significant factor in the decline in audience. That and too much dead time.
Some of the blame for this goes to SABR.
“Chicks dig the long ball”