While I disagree wholeheartedly with the OP and what he thinks needs to be implemented I do agree that there should be no exceptions. This is why Gen Con should not even happen unless the policies in place are minimal.
IE the only policies that should really be in place are mandatory masks (and that is if the CDC still requires them) and sanitization stations available everywhere. That is it, these are the only two adjustments that should be made.
Temperature checks/screens? Vaccination proof upon entry? are you guys serious? do you have any idea how long it would take to get into the convention center?
Social distancing? this is impossible, we cant even social distance properly in a grocery store or restaurant. if social distancing is required then that means limited entry or capacity restrictions are in place, this is an absolute no go. No chance people are signing off paying for hotels stays, air fair and badges to only be allowed a few hours of convention time for the weekend.
Mandatory vaccinations? you as Americans should be against this. you have your free will get the vaccine if you so please. Many many other people have legitimate reasons to not get the vaccine. Do not let people cross yet another line of your civil liberty. if you are vaccinated you don't need to worry about the person not vaccinated.
Vaccination stickers? These should absolutely not be allowed, reason being? this creates an opportunity for animosity or a powder keg situation. You cannot allow people to create a have and have not situation where people with a sticker get serviced a different way or worse yet are being shown negative aggression.
Each and every rule that you want to add or enforce will require more staff, staff that Gen Con doesn't necessarily have. Without proper staffing you then introduce opportunity for people to be "enforcement police" again this leads to a possible powder keg situation. We need to think about less is more in this situation.
Lastly and the me the largest reason less should be more is we cannot control or dictate non Gen Con businesses. You can make all of the restrictions that you would like for Gen Con attendees but none of these rules would apply to anywhere else. Hotels, no, food trucks, no, every other restaurant, no, the mall, no. So unless the changes are minimal, again I would say only masks and sanitizer, Gen Con should consider delaying everything else makes the situation pretty dire.