I see several potential hurdles for large races
1. USAT says 3-4 ft between bikes on racks and iirc ITU said 2m. You're going to need larger transition areas & expo areas and that's going to cost more
2. port o johns are traditionally stacked close together with lines often 20 people deep. You're going to need more space between them and more of them to reduce people density near there which also leads back to point 1
3. WTC already tends to put too many people on too little of a course or has courses that can't really hold the # of people they have in a race leading to packs on the bike, lots of people around each other on the run. With lower race participation #'s some of the racer density issues may be mitigated. If you have the same # of people you're going to have to spread the start times out even more. Let's face it, drafting is often an issue at WT events in NA
4. Expos have too many tables to go to check in. That's going to have to be reduced as well as spread out. See point 1 above.
5. WTC "encourages" one to hang around the race venue. mandatory 3-4night stay in host hotel. For IM awards are the next day. For 70.3 you often can go to lunch, shower at the hotel, hit another place for beers, then have a second lunch somewhere else and still have to kill an hour or so before awards start. You're not going to have an awards banquet (or pre race banquet ) and for 70.3 the awards are often around 3 or 3:30. No one is going to want to hang around others for that long waiting for a piece of metal.
6. You have to reduce touch points. That's going to be tough. aid stations, security for keeping bikes safe overnight, port o johns, expo, awards, parking, on course medical, post event medical, cops, bike support (If you go to bike tech each of the 3d before an IM the # of bikes needing serious work is amazing) and the list goes on. Easily one has 2000 within 6ft interactions from the time you arrive at a WTC event until you leave even if many of those are randomly walking past someone at the expo or bike check in etc
Brian Stover USAT LII
Accelerate3 Coaching Insta