Let's face it.
The Brave Girls revival is led by Korean men of the 30s, the segment of population who put a has-been Lim Changjung ahead of Twice on 2016.
The current iteration of Brave Girls starts from 2016. (all original members from 2011 left by then) and no one really noticed it until somebody put a clip of Korean soldiers cheering to BG a few weeks ago.
Unfortunately such demographic is not likely to contribute much to KPop.
With all the events on hold because of covid, I do not see BG making too much money out of this; they still owe Brave Brother a considerable amount of money since they didn't make too much. Any profit from this round of fame will go to him.
Plus, their sudden rise is not impressing KPop fans,because BG's style is for Korean events , not to impress foreign fandom.
I myself think this will blow. Not a good news for those who like coming-from-the-bottom stories, but both EXID and GFriend had exactly one year of fame, and at that time there were less competition. Now there are simply too much competition for BG to have a lasting presence