That's what I see as being the deal breaker. Someone is going to disregard the rules, and when asked to follow them will become belligerent. That could end up as a lawsuit.
I think a lot of these things come down to whether you choose to see the glass as half-full or half-empty. You earlier posted that it was bad that only 22% of the public is vaccinated. Personally, I think that's good news -- headed in the right direction. Similarly, I think you are overly pessimistic about rules compliance.I manage a public building that has had literally tens of thousands of people through the doors since the pandemic started -- including more then 26,000 just to vote (polling location -- so it was people of all political stripes). In all that time, only 1 person has refused to wear a mask. That person told staff he wouldn't do it. We had a supervisor repeatedly offer a mask and insist that he will have to wear it or leave. Ultimately, after some back and forth, he agreed to wear it, but told us how 'dumb' it was. My point is that I just don't buy that non-compliance is a big problem. People know what they have to do to go to Target, Home Depot or wherever. They may or may not like it, but they know what the deal is when they go there.
If you look on Youtube, you can find a few people getting arrested, so anything can happen. But, these events are extremely rare. Again, my building had tens of thousands of people and zero times we have had to call the police. I have no idea what the lawsuit is about that you are imagining coming out of this.
1) We don't even know what the rules would be yet
2) Virtually everyone WILL follow the rules (even if they don't like them) just like they do everywhere else right now
3) Gen Con would have a plan in place for how to respond if someone doesn't follow the rules
The glass is half full. And there are four lights.
Despite what people may tell their friends, family, and pollsters, people are getting out there and traveling for leisure more and more. The increase of young people, families, and retirement-age folk in the airport has been steadily going up. If GenCon is on, people will come.
Besides a break in March/April 2020, I have been flying 1-2 times a months for work during the rest of 2020 and into 2021. Despite what the news would like to have us think, I have yet to see a "situation" in the airport or on the airplane regarding policy/mask compliance that escalated beyond someone being gently reminded and then complying. Peer pressure works wonders. All that is to say that I agree that the rate of compliance with easy-to-follow policies such as masking -should those policies be put in place- will likely be higher than people may think.
That being said, even with a protocol to address non-compliance, will full compliance be 100% at all times and will there be Gencon/security staff available to run up and ring the shame-bell at a non-compliant person as soon as you see them? Of course not; only casinos have the money and infrastructure to monitor large groups like that.
Whatever people think regarding a vaccination requirement, I do not believe GenCon has the resources to implement such a policy beyond a questionnaire or waiver. I have traveled to several states that require proof of a recent negative Covid19 test or proof of recovered infection to enter the state without quarantining. I have been compliant in having the proper documentation, but the only time I was asked to produce that documentation was a request to email it to someone at a health department; however, failure to do this would not have prevented me from leaving the airport or going about my business. States can draw on public dollars and federal aid, and they have had a year to get their existing policies where they are- if they don't have the resources for in-depth monitoring, document collection, and follow up, I don't think it's likely that GenCon does.