Stop building dvc and sports complexes. We do not need anything else that will add more people here.
Quite a few uses of the arena are actually events that already happen in other places. Such as the Indiana Jones arena at DHS being used for cheer competitions. Or the marathon expos that already happen elsewhere.
Also if someone is at WDW for a sports competition the majority of their time will be spent doing sports, visits to the parks is a secondary thing