Stadiums are decent for the local economy.

But public transit is so much better. Stadiums are only good for the area surrounding the stadium and even then, so much of a stadium’s footprint is empty parking lot. It’s a huge waste of land, contributes to poor drainage and worse heat and is an ongoing expense.

Transit takes cars off the road, making driving better for everyone, it can be profitable for the city, it allows for businesses to flourish with more customers nearby (because they’re not forced to rely on being somewhere with parking)… A public transit system is a much better use of tax money than another stadium.