There is not a simple solution to getting attendees out to the Stadium - other than to schedule compelling games there that attendees will pre-register and then show up for.
Just like how the JW took time to be "normal," the Stadium will come to be as much a part of the show as any other space. And we still see people complaining that the JW, or any hotel, or even different corners of the event hall in the convention center itself are all too far away and there's no way an event there will get any walk-by traffic, etc. There will always be those complaints.
Events are scheduled in spaces based on their operational needs, preferences, applicable contract, suitable spaces, and historical data of the ratio of directly ticketed players vs generics, and that general trend is not likely to change in the near future.
Senior Event & Program Manager
Gen Con LLC