I wasn't aware of these new rules either BUT I do know that something similar happened from this season in Eredivise on crowd disturbances -- in Dutch football's case, hooliganism is the problem creeping back up so they decided to do something about it. One game pause to allow the club/stadium to try and keep things under control. But after restart, if a second incident happens, then the game is called off. I don't know the exact details but I believe one match was called off already for those circumstances.
I think US also has some kind of rule for halting/forfeiting matches if crowd ignores ref warnings, but that shouldn't apply to internationals. Don't know enough about Concacaf to be honest but I suspect Mexico is a repeat offender with this abusive chanting, and they take it to some extremes, so they probably tried to crack down on it.
Slissy has Spain as the champions... it's one of only two answers we have different, so I'm going to be rooting (and probably betting, due to value odds) for Croatia.
Re all favs winning: I went for yes, which is quite unlike me as I always insist among the favourites on match day, one has to not win. Fortunately for me, Slissy also chose yes.
Try to see you guys on ClubTalk later!