BTS came back to Korea recently and had a HUGE press conference about their Billboard win.
Other than obviously saying thank you, and that they want to collab with Chainsmokers (lol) they also talked about using their new super-stardom in America to debut as English-speaking stars.
The answer was pretty clearly, nope.
Rap Mon: "미국 진출 계획은 없습니다. 우리는 한국 가수입니다."
We don't have plans to enter/debut in the US. We're Korean singers.
Jimin: "다음 빌보드에 설 수 있다면, 한국어로 된 우리 노래로 무대에 오르고 싶습니다."
If invited to the next Billboard, we want to perform our songs in Korean.