An alternative point of view from staff here. personal opinion, I have no insight on how any of these venues are selected.
Iāve been attending worlds since 2011, and from 2012 on have been a key volunteer or staff.
Anaheim (2012-2014) was great, close to home and hotel next door, but venue became too small for worlds.
Louisville, honestly I didnāt really like, difficult to travel to, hotel being a bus ride away was a huge negative when working long days, but it was a seven day event so we coped. But exhibition space was big and that really helped with division layout etc.
Dallas was a long event, 11 days for me, longer for some other staff members, so having the hotel connected and 5 minutes away when we are working 12+ hour days pretty much outweighs any other negative aspects. Smaller than KEC made decisions on where divisions and skills located more difficult and gave us new technical challenges to deal with.
Looking up the convention center in Indianapolis suggests that exhibit space is even smaller than Dallas and, as the majority of the event does not happen in the arena, thatās probably an issue, not sure we can go much smaller than Dallas.
wikipedia suggest these numbers, may or may not be accurate.
KEC Louisville
1,300,000 square feet (120,000 m2) of indoor space
Kay Bailey Dallas
1,000,000 sq ft (93,000 m2) of exhibit space.
Indianapolis
566,600 square feet (50,000 m2) of exhibit space