That's what a das is designed for as you noted. They are pretty common at stadiums now.
Common yes, but still not great performers when the stadium loads up. Ideally, you try and distribute the amount of people out with as many cells as possible, giving each user as many resources as possible. In a regular office building, the answer is easy because you can get the signal very close to the customers and use more cells and less power to achieve greater signal to noise ratio and happier customers with less loaded cells. Stadiums are difficult with where you are able to mount antennas so you need more power. More power with more cells increases the noise and is therefore, bad.
It's a struggle that is realty with daily in the wireless venue world.
