I've been toying with the idea of a "Pan-American" cup in my head for a while, but I don't see it happening unless a massive sugar daddy pops up, or MS decides to go for regionalised events.I agree, it wouldn't be the same level we are used to seeing. However, theoretically, as the lower-ranked players in those regions played the top players more often they would get better. I think NA/SA could have a pretty good event. Hera, Daniel, Nicov, Dogao, Miguel, Slam, Capoch, Bruh, F1re, St4rk, Ra, Chris, plus any one else I am missing. That's a pretty good group for a tournament. Obviously, it's not the same as what we are used to seeing, but the games would still be great.
Your list is pretty good, you're probably only missing Hearttt among the favourites (and Ra and Chris are probably a step below the rest of those still, particularly since Chris is inactive). Furthermore, the "second tier" of player would probably include some pretty strong players, such as the Chilean guys, who are more than capable of providing good games, RiuT (a bit inactive), GoKu, Twigg, Fedex (currently inactive), Lucky_Rox, who recently managed to at least squeeze into HC qualifiers, Scotty, Inc and Spring. It should be possible to have at least 32 relatively strong players.