My quick thoughts on your list:
1. Are you saying to hold the events separately, or count the results separately? I would be on board with the latter, but I'm not sure the first is practical. It's an entirely different competition, but I have some experience with showing dairy cattle. In those competitions there are typically separate entries and prizes for "junior" (roughly through high school) and "open" classes, but they compete head to head. As far as scramblers and judges competing, I agree in principle, perhaps corporate sponsorship would allow hiring professional judges and scramblers. Short of that, my suspicion is that this kind of rule would make it very difficult to staff a competition.
2. 100% agreed. I think that Red Bull's format is good in that regard.
3. Agreed.
4. What do you mean by elimination of 4, 6, 8? I do not think that one-on-one elimination would be a good fit for larger competitions, as it makes determining placings below the top few very difficult, but for a media event it's great.
5. Yes.
6. Yes, 100%. I believe that I understood Dana Yi to say in her video that she would not compete if this were not changed. I find it hard to believe that Red Bull would not make a strong effort to open that up if they get the kind of push-back that it sounds like they're getting.