Daughters of the Dragon getting their own film would be like Foggy Nelson getting his own film instead of being on Daredevil. They're Iron Fist supporting characters. Deal with it.
Unlike Foggy Nelson, they had their own solo adventures which is where I discovered them. In Deadly Hands mag., and Bizzarre Adventure.
Unlike Foggy they also had their own "Brand" name as seen in the Marvel Team-Up title and Marvel Comics Presents, and special.
All
Independent of Iron-Fist.
And then later miniseries ...etc.
So no they are not like Foggy.
Does that guarantee a movie, no, it is unlikely, But if they ever decided they wanted to do a female team, they could use them (and the expanded team) , or for specifically a more street level TV series.
But anyway this was in fun, in the spirit of
fan casting, relax!
The Marvel Cinematic U was realized and prides itself on it's Dark Horse properties, starting with Blade.
That's what made them unique.
Deal with it.