Ok, I'm gonna be brief and give my own lil policy suggestion, even clearly I'm way less experienced nor involved than other users that posted.
If we are talking about bad precedents, what I consider a horrible one is taking for real the possibility of retroactively deleting an already started round because of an appeal made by a losing team of the previous week. Imagine the gigantic multiplication of appeals everywhere, and specially here, if such decision is made by the hosts. People grabbing any minimum mistake, distraction or just lack of professionalism of their last round opponents to try and stop an already started round, with people having prepped and taken their times to battle getting bamboozled by the possibility of all their work getting reversed, maybe just for having to repeat all again. Also it opens questions like: how much time can pass since the next round started for an appeal to be able to cancel it? And what should be done with the games already played? Are those officially erased, or if the team that originally classified survives the appeal, they are still valid and accounted for, even if the appealed team had to work and put their efforts on two teams in one week? That's what I call a horrible precedent, and there is a reason why a sport match getting replayed once it's ended is extremely rare, and utterly impossible to see a round with games played getting canceled to repeat a previous round match for any kind of appeal.
My proposal here is simple. Given the impossibility of retroactively remaking the week without leaving a very dangerous precedent, if the act call is deemed as erroneous, the ones that should be penalized here aren't team Argentina, it's the hosts. US' critics are against their decision to move on, and to the lack of swift and fair decisions. The tour should continue, with support and supervision of the next in importance over the hosts, like Amaranth said, the RoA leaders. After that, the hosts should be penalized with the incapacity of hosting tours of big importance (definition at criteria of the leaders that, at the end of the day, approved them as hosts), but not for ostracizing them, but for making time for them to gain experience hosting less important events. I've worked already with around 10 users that wanted to host and that wanted to learn from their mistakes, only in the Randbats environment, and I'm sure there will be a lot of opportunities for doing so here as well.
Edit: welp Excal posted while I was writing this. Anyhow I think it's a nice measure to take, for everyone to understand that sometimes mistakes are just a sign that it's time to learn, and hopefully Smogon can have that policy view on things like this.