With 8 regular season home games you don’t need a stadium 365 days a year. In fact it is uneconomic.
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Maybe you can educate Jerry Jones about that.
AT&T Stadium is booked for numerous and varied events during the year. State high school football playoffs, college football games, moto-cross, monster trucks, concerts, etc.
And Jerry Jones would not do better with 8 additional NFL games instead of 8 high school games and moto-cross?
Stadiums don’t need 2 NFL teams but they will do better.