I definitely feel there should be more international teams out there. As someone who has met people from around the world and likes learning about different world cultures, I certainly like groups like MI:13, Euroforce (that Swordswoman character was neat), the Winter Guard, and Big Hero 6. Considering how big the movie was, I really feel that Marvel should capitalize on the mainstream success of Big Hero 6 in some way. In terms of China, I definitely saw potential in S.P.E.A.R. and The Ascendant. Part of me really wants to see Shang-Chi join that group.
Still, there are hurdles when pushing said international teams. Personally, I think pushing a Chinese superhero team especially is challenging because, like it or not, there are significant cultural differences between mainland China and America. Now, I think DC has been doing a better job at producing Chinese superhero teams and heroes than Marvel. The Great Ten (or is it Great Twenty?) and Super-Man are steps in the right direction. I was particularly impressed with the Great Ten series published about 10 or so years ago, because there were a lot of aspects of Chinese history and culture put in there. As has been stressed previously in this thread, it wouldn't hurt to have a writer do his or her research on the country or culture and for the Great Ten series, the writer did his research. Gene Yuen Yang has been doing the same thing with Super-Man, so there is an aura of authenticity.
Still, there are things which one can't find in a book, which a person from that country would recognize as being a little off. For instance, I remember in The Ascendant that there was a character who's last name sounded Cantonese and who was very, VERY defiant of the government. Those things would be odd to a mainland Chinese reader. Even Gene Yang has stated that even though he's Chinese-American, he's a little far removed from the culture of mainland China and can't capture certain nuances. Conversely, having a person from mainland China write a Marvel Chinese superhero series would probably turn off some non-Mainland Chinese readers. Still, could these characters bridge the gap and end up in The Avengers one day?:
Perhaps. They do look pretty cool. But I guarantee, if a mainland Chinese writer published this series, an American audience might find characteristics, or mannerisms slightly odd.
It's a sucky dilemma, I know. I'm all for teams from other parts of the world. I'm firmly of the belief that citizenship, culture, and or any kind of background shouldn't prohibit anyone from writing another's perspective. But again, there are those little nuances, those tiny details that only someone from a particular culture or country would understand and show.